blink: Enable JPEG YUV decoding on TOT

The JPEG YUV decoding experiment has concluded and can now be enabled on
TOT. This change enables YUV decoding for JPEG images by default and
removes the field trial testing config.

Bug: 919627
Change-Id: Ic3742750af59fa3b4e6dedc2f55424d4a87afcad
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2216712Reviewed-by: Steven Holte <holte@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Sasha McIntosh <sashamcintosh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#772724}

testing/variations/fieldtrial_testing_config.json

@@ -1779,27 +1779,6 @@
             ]
         }
     ],
-    "DecodeJpegToYuv": [
-        {
-            "platforms": [
-                "android",
-                "android_weblayer",
-                "android_webview",
-                "chromeos",
-                "linux",
-                "mac",
-                "windows"
-            ],
-            "experiments": [
-                {
-                    "name": "Experiment",
-                    "enable_features": [
-                        "DecodeJpeg420ImagesToYUV"
-                    ]
-                }
-            ]
-        }
-    ],
     "DefaultBrowserInfobar": [
         {
             "platforms": [

third_party/blink/common/features.cc

@@ -246,8 +246,8 @@ const char kMixedContentAutoupgradeModeAllPassive[] = "all-passive";
 // Decodes jpeg 4:2:0 formatted images to YUV instead of RGBX and stores in this
 // format in the image decode cache. See crbug.com/919627 for details on the
 // feature.
-const base::Feature kDecodeJpeg420ImagesToYUV{
-    "DecodeJpeg420ImagesToYUV", base::FEATURE_DISABLED_BY_DEFAULT};
+const base::Feature kDecodeJpeg420ImagesToYUV{"DecodeJpeg420ImagesToYUV",
+                                              base::FEATURE_ENABLED_BY_DEFAULT};
 
 // Decodes lossy WebP images to YUV instead of RGBX and stores in this format
 // in the image decode cache. See crbug.com/900264 for details on the feature.