media: Remove VP9 flag, and enable VP9 support by default.

media/base/run_all_unittests.cc

Index: media/base/run_all_unittests.cc
diff --git a/media/base/run_all_unittests.cc b/media/base/run_all_unittests.cc
index 4a6d272b9a4d109c70aa7479fe45b656db0cb4c4..4274634d0b770db15700f8d7df296ea78fdce48b 100644
--- a/media/base/run_all_unittests.cc
+++ b/media/base/run_all_unittests.cc
@@ -34,13 +34,10 @@ void TestSuiteNoAtExit::Initialize() {
   // Run this here instead of main() to ensure an AtExitManager is already
   // present.
   media::InitializeMediaLibraryForTesting();
-  // Enable VP9 video codec support for all media tests.
-  // TODO(tomfinegan): Remove this once the VP9 flag is removed or negated.
-  CommandLine* cmd_line = CommandLine::ForCurrentProcess();
-  cmd_line->AppendSwitch(switches::kEnableVp9Playback);
   // Enable VP8 alpha support for all media tests.
   // TODO(tomfinegan): Remove this once the VP8 alpha flag is removed or
   // negated.
+  CommandLine* cmd_line = CommandLine::ForCurrentProcess();
   cmd_line->AppendSwitch(switches::kEnableVp8AlphaPlayback);
 }