Enable CSSFontLoadingReducedLayoutInvalidations by default on trunk

Finch experiments results on M85 [1] look good, so this patch enables
it by default on trunk.

A follow up patch will ship in all channels it via finch.

[1] https://docs.google.com/document/d/1HenoksopNhJKvUfITMnfBPTllPSNcUVH06yCJB3asj4/edit?usp=sharing

Bug: 441925
Change-Id: Ibd4f308875ff89979af83cf7b9a5e74709b5fba0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2429514Reviewed-by: Mark Pearson <mpearson@chromium.org>
Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Commit-Queue: Xiaocheng Hu <xiaochengh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810909}

testing/variations/fieldtrial_testing_config.json

@@ -1236,27 +1236,6 @@
             ]
         }
     ],
-    "CSSReducedFontLoadingLayoutInvalidations": [
-        {
-            "platforms": [
-                "android",
-                "android_weblayer",
-                "android_webview",
-                "chromeos",
-                "linux",
-                "mac",
-                "windows"
-            ],
-            "experiments": [
-                {
-                    "name": "Enabled",
-                    "enable_features": [
-                        "CSSReducedFontLoadingLayoutInvalidations"
-                    ]
-                }
-            ]
-        }
-    ],
     "CacheStorageSequenceChromeOS": [
         {
             "platforms": [

third_party/blink/common/features.cc

@@ -528,7 +528,7 @@ const base::Feature kDawn2dCanvas{"Dawn2dCanvas",
 
 const base::Feature kCSSReducedFontLoadingLayoutInvalidations{
     "CSSReducedFontLoadingLayoutInvalidations",
-    base::FEATURE_DISABLED_BY_DEFAULT};
+    base::FEATURE_ENABLED_BY_DEFAULT};
 
 // When enabled, frees up CachedMetadata after consumption by script resources
 // and modules. Needed for the experiment in http://crbug.com/1045052.

third_party/blink/renderer/platform/runtime_enabled_features.json5

@@ -568,7 +568,7 @@
       // Perform partial layout invalidation on web font loading.
       // See https://crbug.com/441925 and https://bit.ly/35JjPmq for details.
       name: "CSSReducedFontLoadingLayoutInvalidations",
-      status: "test",
+      status: "stable",
     },
     {
       name: "CSSRevert",