[scheduler] Enable BlinkSchedulerDisableAntiStarvationForPriorities by default

Stable finch data did not show any regressions, so enabling this by
default.

Bug: 968815
Change-Id: I02e080c116e8433520fd2500d76d74fdab98201e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1952164Reviewed-by: Sami Kyöstilä <skyostil@chromium.org>
Reviewed-by: Alexander Timin <altimin@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Scott Haseley <shaseley@chromium.org>
Cr-Commit-Position: refs/heads/master@{#721858}

testing/variations/fieldtrial_testing_config.json

@@ -1292,25 +1292,6 @@
             ]
         }
     ],
-    "BlinkSchedulerDisableAntiStarvationForPriorities": [
-        {
-            "platforms": [
-                "android",
-                "chromeos",
-                "linux",
-                "mac",
-                "windows"
-            ],
-            "experiments": [
-                {
-                    "name": "Enabled",
-                    "enable_features": [
-                        "BlinkSchedulerDisableAntiStarvationForPriorities"
-                    ]
-                }
-            ]
-        }
-    ],
     "BlinkSchedulerHighPriorityInputOnCompositorThread": [
         {
             "platforms": [

third_party/blink/renderer/platform/scheduler/common/features.h

@@ -221,7 +221,7 @@ extern const char PLATFORM_EXPORT kFreezableTaskTypesListParam[];
 // enabled.
 const base::Feature kBlinkSchedulerDisableAntiStarvationForPriorities{
     "BlinkSchedulerDisableAntiStarvationForPriorities",
-    base::FEATURE_DISABLED_BY_DEFAULT};
+    base::FEATURE_ENABLED_BY_DEFAULT};
 
 // Enable setting high priority database task type from field trial parameters.
 const base::Feature kHighPriorityDatabaseTaskType{