Turn on Media History by default

BUG=1024351

Change-Id: Id01595e63f5f776a226087741ef602ba30b80328
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2295224
Auto-Submit: Becca Hughes <beccahughes@chromium.org>
Commit-Queue: Tommy Steimel <steimel@chromium.org>
Reviewed-by: Tommy Steimel <steimel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#787954}

media/base/media_switches.cc

@@ -405,7 +405,7 @@ const base::Feature kUseNewMediaCache{"use-new-media-cache",
 
 // Enables using the media history store to store media engagement metrics.
 const base::Feature kUseMediaHistoryStore{"UseMediaHistoryStore",
-                                          base::FEATURE_DISABLED_BY_DEFAULT};
+                                          base::FEATURE_ENABLED_BY_DEFAULT};
 
 // Use R16 texture for 9-16 bit channel instead of half-float conversion by CPU.
 const base::Feature kUseR16Texture{"use-r16-texture",