AW UMA: delete fieldtrial config for WebViewCollectNonEmbeddedMetrics

WebViewCollectNonEmbeddedMetrics feature flag has been removed in
crrev.com/c/2252082 and there is no need to test this config any more.

Bug: 1001185, b/157911640
Test: N/A
Change-Id: I1c94b1c24f8b8a488eef94f4ccd5697ca2043643
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2283210
Commit-Queue: Steven Holte <holte@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Auto-Submit: Hazem Ashmawy <hazems@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#786158}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: aee069038a5806a16bb58893d55d894e0c318dc9
diff --git a/variations/fieldtrial_testing_config.json b/variations/fieldtrial_testing_config.json
index 208f9b7..3e0b503 100644
--- a/variations/fieldtrial_testing_config.json
+++ b/variations/fieldtrial_testing_config.json
@@ -8006,21 +8006,6 @@
             ]
         }
     ],
-    "WebViewCollectNonEmbeddedMetrics": [
-        {
-            "platforms": [
-                "android_webview"
-            ],
-            "experiments": [
-                {
-                    "name": "Enabled",
-                    "enable_features": [
-                        "WebViewCollectNonEmbeddedMetrics"
-                    ]
-                }
-            ]
-        }
-    ],
     "WebXrPermissionsApi": [
         {
             "platforms": [