Revert "Use lkgm file for Lacros public builders"

This reverts commit 680ffd20544ed36a11d9bc2c15046f617491551a.

Reason for revert: Broke dawn roll

BUG=331775413
Original change's description:
> Use lkgm file for Lacros public builders
>
> Use lkgm version from //chromeos/CHROMEOS_LKGM instead of
> the buildbot config.
>
> Change-Id: Iece7ed466cad621eee91e10e6293c8c409f3f724
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5384923
> Commit-Queue: Sven Zheng <svenzheng@chromium.org>
> Reviewed-by: Kuan Huang <kuanhuang@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1278672}

Change-Id: Ibf7b361022b3af9bc94fbb41f19902d0b99033fe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5407354
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Auto-Submit: Sven Zheng <svenzheng@chromium.org>
Commit-Queue: Sven Zheng <svenzheng@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1280206}
diff --git a/infra/config/generated/testing/variants.pyl b/infra/config/generated/testing/variants.pyl
index 2c43eb35..4607c44 100644
--- a/infra/config/generated/testing/variants.pyl
+++ b/infra/config/generated/testing/variants.pyl
@@ -172,7 +172,7 @@
     'identifier': 'TROGDOR_PUBLIC_LKGM',
     'skylab': {
       'cros_board': 'trogdor',
-      'use_lkgm': True,
+      'cros_img': 'trogdor-public/R125-15826.0.0',
       'bucket': 'chromiumos-image-archive',
     },
   },
@@ -181,7 +181,7 @@
     'skylab': {
       'cros_board': 'volteer',
       'cros_model': 'voxel',
-      'use_lkgm': True,
+      'cros_img': 'volteer-public/R125-15826.0.0',
       'bucket': 'chromiumos-image-archive',
       'dut_pool': 'chromium',
       'public_builder': 'cros_test_platform_public',
diff --git a/infra/config/targets/cros-skylab-variants.json b/infra/config/targets/cros-skylab-variants.json
index f6839e1..9386aee 100644
--- a/infra/config/targets/cros-skylab-variants.json
+++ b/infra/config/targets/cros-skylab-variants.json
@@ -181,7 +181,8 @@
   "CROS_TROGDOR_PUBLIC_LKGM": {
     "skylab": {
       "cros_board": "trogdor",
-      "use_lkgm": true,
+      "cros_chrome_version": "124.0.6366.0",
+      "cros_img": "trogdor-public/R125-15826.0.0",
       "bucket": "chromiumos-image-archive"
     },
     "enabled": true,
@@ -199,7 +200,8 @@
     "skylab": {
       "cros_board": "volteer",
       "cros_model": "voxel",
-      "use_lkgm": true,
+      "cros_chrome_version": "124.0.6366.0",
+      "cros_img": "volteer-public/R125-15826.0.0",
       "bucket": "chromiumos-image-archive",
       "dut_pool": "chromium",
       "public_builder": "cros_test_platform_public",
diff --git a/testing/buildbot/chromium.chromiumos.json b/testing/buildbot/chromium.chromiumos.json
index 23013e31..b3160178 100644
--- a/testing/buildbot/chromium.chromiumos.json
+++ b/testing/buildbot/chromium.chromiumos.json
@@ -1372,6 +1372,7 @@
         "bucket": "chromiumos-image-archive",
         "ci_only": true,
         "cros_board": "volteer",
+        "cros_img": "volteer-public/R125-15826.0.0",
         "cros_model": "voxel",
         "dut_pool": "chromium",
         "name": "chromeos_integration_tests VOLTEER_PUBLIC_LKGM",
@@ -1379,7 +1380,6 @@
         "public_builder_bucket": "testplatform-public",
         "test": "chromeos_integration_tests",
         "test_id_prefix": "ninja://chrome/test:chromeos_integration_tests/",
-        "use_lkgm": true,
         "variant_id": "VOLTEER_PUBLIC_LKGM"
       }
     ]
@@ -1538,6 +1538,7 @@
         "bucket": "chromiumos-image-archive",
         "ci_only": true,
         "cros_board": "volteer",
+        "cros_img": "volteer-public/R125-15826.0.0",
         "cros_model": "voxel",
         "dut_pool": "chromium",
         "name": "lacros_all_tast_tests VOLTEER_PUBLIC_LKGM",
@@ -1553,7 +1554,6 @@
         "test_id_prefix": "ninja://chromeos/lacros:lacros_all_tast_tests/",
         "test_level_retries": 2,
         "timeout_sec": 10800,
-        "use_lkgm": true,
         "variant_id": "VOLTEER_PUBLIC_LKGM"
       }
     ]
@@ -1582,16 +1582,17 @@
         "autotest_name": "chromium",
         "bucket": "chromiumos-image-archive",
         "cros_board": "trogdor",
+        "cros_img": "trogdor-public/R125-15826.0.0",
         "name": "chromeos_integration_tests TROGDOR_PUBLIC_LKGM",
         "test": "chromeos_integration_tests",
         "test_id_prefix": "ninja://chrome/test:chromeos_integration_tests/",
-        "use_lkgm": true,
         "variant_id": "TROGDOR_PUBLIC_LKGM"
       },
       {
         "autotest_name": "tast.lacros-from-gcs",
         "bucket": "chromiumos-image-archive",
         "cros_board": "trogdor",
+        "cros_img": "trogdor-public/R125-15826.0.0",
         "name": "lacros_all_tast_tests TROGDOR_PUBLIC_LKGM",
         "resultdb": {
           "enable": true,
@@ -1603,7 +1604,6 @@
         "test_id_prefix": "ninja://chromeos/lacros:lacros_all_tast_tests/",
         "test_level_retries": 2,
         "timeout_sec": 10800,
-        "use_lkgm": true,
         "variant_id": "TROGDOR_PUBLIC_LKGM"
       }
     ]
diff --git a/testing/buildbot/tryserver.chromium.chromiumos.json b/testing/buildbot/tryserver.chromium.chromiumos.json
index 400bfbcd..264abfc 100644
--- a/testing/buildbot/tryserver.chromium.chromiumos.json
+++ b/testing/buildbot/tryserver.chromium.chromiumos.json
@@ -10,6 +10,7 @@
         "autotest_name": "chromium",
         "bucket": "chromiumos-image-archive",
         "cros_board": "volteer",
+        "cros_img": "volteer-public/R125-15826.0.0",
         "cros_model": "voxel",
         "dut_pool": "chromium",
         "name": "chromeos_integration_tests VOLTEER_PUBLIC_LKGM",
@@ -17,13 +18,13 @@
         "public_builder_bucket": "testplatform-public",
         "test": "chromeos_integration_tests",
         "test_id_prefix": "ninja://chrome/test:chromeos_integration_tests/",
-        "use_lkgm": true,
         "variant_id": "VOLTEER_PUBLIC_LKGM"
       },
       {
         "autotest_name": "tast.lacros-from-gcs",
         "bucket": "chromiumos-image-archive",
         "cros_board": "volteer",
+        "cros_img": "volteer-public/R125-15826.0.0",
         "cros_model": "voxel",
         "dut_pool": "chromium",
         "name": "lacros_all_tast_tests VOLTEER_PUBLIC_LKGM",
@@ -39,7 +40,6 @@
         "test_id_prefix": "ninja://chromeos/lacros:lacros_all_tast_tests/",
         "test_level_retries": 2,
         "timeout_sec": 10800,
-        "use_lkgm": true,
         "variant_id": "VOLTEER_PUBLIC_LKGM"
       }
     ]
diff --git a/testing/buildbot/variants.pyl b/testing/buildbot/variants.pyl
index 2c43eb35..4607c44 100644
--- a/testing/buildbot/variants.pyl
+++ b/testing/buildbot/variants.pyl
@@ -172,7 +172,7 @@
     'identifier': 'TROGDOR_PUBLIC_LKGM',
     'skylab': {
       'cros_board': 'trogdor',
-      'use_lkgm': True,
+      'cros_img': 'trogdor-public/R125-15826.0.0',
       'bucket': 'chromiumos-image-archive',
     },
   },
@@ -181,7 +181,7 @@
     'skylab': {
       'cros_board': 'volteer',
       'cros_model': 'voxel',
-      'use_lkgm': True,
+      'cros_img': 'volteer-public/R125-15826.0.0',
       'bucket': 'chromiumos-image-archive',
       'dut_pool': 'chromium',
       'public_builder': 'cros_test_platform_public',