Fix Ozone ECS bot

Remove components.gpy:session_manager_component from global dependency
list since it is already included if chromeos==1 or use_ash==1.

BUG=none
CQ_EXTRA_TRYBOTS=tryserver.chromium.linux:android_chromium_gn_compile_dbg,android_chromium_gn_compile_rel;tryserver.chromium.win:win8_chromium_gn_rel,win8_chromium_gn_dbg;tryserver.chromium.mac:mac_chromium_gn_rel,mac_chromium_gn_dbg;tryserver.chromium.linux:linux_ecs_ozone
TBR=brettw@chromium.org

Review URL: https://codereview.chromium.org/986383003

Cr-Commit-Position: refs/heads/master@{#320181}
diff --git a/BUILD.gn b/BUILD.gn
index 8ddda06..9903afb 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -212,6 +212,10 @@
       "//sandbox/linux:sandbox_linux_unittests",
       "//sandbox/linux:sandbox_linux_jni_unittests",
     ]
+
+    if (is_chromeos || use_ash) {
+      deps += [ "//components/session_manager/core" ]
+    }
   }
 
   if (is_linux && !is_chromeos) {
@@ -240,7 +244,6 @@
       "//chrome/tools/profile_reset:jtl_compiler",
       "//components:components_perftests",
       "//components/network_hints/browser",
-      "//components/session_manager/core",
       "//components/webui_generator",
       "//content/public/app:browser",
       "//content/public/app:child",