Enable preload=metadata lazy load everywhere.

Turns out I should have pulled the latest 28D data for 74 before
limiting to !CrOS && !macOS. No regressions are shown in that data
anymore, so enable eveywhere.

This leaves the flag in for now until we reach stable.

BUG=879406
TBR=liberato

Change-Id: I48bd5440893ee2c74b8cc54d5575d0347b2b7e78
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1623487Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#662017}

media/base/media_switches.cc

@@ -199,19 +199,10 @@ const base::Feature kPictureInPicture {
 #endif
 };
 
-// Only decode preload=metadata elements upon visibility. Experiment results
-// vary across platforms and are still being analyzed on macOS and CrOS.
-//
-// Android, Windows, and Linux all saw improvements without regressions, so
-// enable by default there.
-const base::Feature kPreloadMetadataLazyLoad {
-  "PreloadMetadataLazyLoad",
-#if defined(OS_MACOSX) || defined(OS_CHROMEOS)
-      base::FEATURE_DISABLED_BY_DEFAULT
-#else
-      base::FEATURE_ENABLED_BY_DEFAULT
-#endif
-};
+// Only decode preload=metadata elements upon visibility.
+// TODO(crbug.com/879406): Remove this after M76 ships to stable.
+const base::Feature kPreloadMetadataLazyLoad{"PreloadMetadataLazyLoad",
+                                             base::FEATURE_ENABLED_BY_DEFAULT};
 
 // Let videos be resumed via remote controls (for example, the notification)
 // when in background.