[Lookalikes] Enable target embedding by default on ToT.

Bug: 1076617
Change-Id: I5d818d4db60fad9e4cdc8e862d82a5bff6372560
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2505583
Auto-Submit: Joe DeBlasio <jdeblasio@chromium.org>
Commit-Queue: Steven Holte <holte@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821978}

components/lookalikes/core/features.cc

@@ -8,7 +8,7 @@ namespace lookalikes {
 namespace features {
 
 const base::Feature kDetectTargetEmbeddingLookalikes{
-    "TargetEmbeddingLookalikes", base::FEATURE_DISABLED_BY_DEFAULT};
+    "TargetEmbeddingLookalikes", base::FEATURE_ENABLED_BY_DEFAULT};
 
 const base::Feature kLookalikeInterstitialForPunycode{
     "LookalikeInterstitialForPunycode", base::FEATURE_DISABLED_BY_DEFAULT};

testing/variations/fieldtrial_testing_config.json

@@ -4120,25 +4120,6 @@
             ]
         }
     ],
-    "LookalikeTargetEmbeddingHeuristic": [
-        {
-            "platforms": [
-                "android",
-                "chromeos",
-                "linux",
-                "mac",
-                "windows"
-            ],
-            "experiments": [
-                {
-                    "name": "Enabled",
-                    "enable_features": [
-                        "TargetEmbeddingLookalikes"
-                    ]
-                }
-            ]
-        }
-    ],
     "LowPriorityAdProcesses": [
         {
             "platforms": [