Enable AllowBFCacheWhenClosedMediaStreamTrack by default

As our experiment goes well, we are planning to launch this feature.
This CL updates the feature to be enabled by default.

Bug: 1502395
Change-Id: I7db4af6f864fab2fd9a41fee74ebae569ec7122f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5410615
Commit-Queue: Mingyu Lei <leimy@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1281083}
diff --git a/testing/variations/fieldtrial_testing_config.json b/testing/variations/fieldtrial_testing_config.json
index db58d67..d3bb5e249 100644
--- a/testing/variations/fieldtrial_testing_config.json
+++ b/testing/variations/fieldtrial_testing_config.json
@@ -222,25 +222,6 @@
             ]
         }
     ],
-    "AllowBFCacheWhenClosedMediaStreamTrack": [
-        {
-            "platforms": [
-                "android",
-                "chromeos",
-                "linux",
-                "mac",
-                "windows"
-            ],
-            "experiments": [
-                {
-                    "name": "Enabled_20231219",
-                    "enable_features": [
-                        "AllowBFCacheWhenClosedMediaStreamTrack"
-                    ]
-                }
-            ]
-        }
-    ],
     "AllowDatapipeDrainedAsBytesConsumerInBFCache": [
         {
             "platforms": [
diff --git a/third_party/blink/common/features.cc b/third_party/blink/common/features.cc
index d77af21..e1bacf37 100644
--- a/third_party/blink/common/features.cc
+++ b/third_party/blink/common/features.cc
@@ -56,10 +56,10 @@
              base::FEATURE_DISABLED_BY_DEFAULT);
 
 // Make MediaDevicesDispatcherHost and ended MediaStreamTrack not block BFCache.
-// See https://chrbug.com/1502395 for more details.
+// See https://crbug.com/1502395 for more details.
 BASE_FEATURE(kAllowBFCacheWhenClosedMediaStreamTrack,
              "AllowBFCacheWhenClosedMediaStreamTrack",
-             base::FEATURE_DISABLED_BY_DEFAULT);
+             base::FEATURE_ENABLED_BY_DEFAULT);
 
 // Block all MIDI access with the MIDI_SYSEX permission
 BASE_FEATURE(kBlockMidiByDefault,