Enable MediaSourceTest.* content_browsertests on Android.

Sprinkling a little command line flag magic reveals these tests actually pass!

BUG=243843

Review URL: https://chromiumcodereview.appspot.com/16034007

git-svn-id: http://src.chromium.org/svn/trunk/src/build@204634 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

android/pylib/gtest/filter/content_browsertests_disabled

@@ -107,10 +107,3 @@ IndexedDBBrowserTestWithVersion123456Schema.DestroyTest
 IndexedDBBrowserTestWithVersion987654SSVData.DestroyTest
 IndexedDBLayoutTest.*
 BlobLayoutTest.XhrResponseBlob
-
-# http://crbug.com/243843
-MediaSourceTest.ConfigChangeVideo
-MediaSourceTest.Playback_AudioOnly_WebM
-MediaSourceTest.Playback_Type_Error
-MediaSourceTest.Playback_VideoAudio_WebM
-MediaSourceTest.Playback_VideoOnly_WebM