Enable VP9 in MP4 by default

chrome/browser/media/encrypted_media_supported_types_browsertest.cc

Index: chrome/browser/media/encrypted_media_supported_types_browsertest.cc
diff --git a/chrome/browser/media/encrypted_media_supported_types_browsertest.cc b/chrome/browser/media/encrypted_media_supported_types_browsertest.cc
index 9e2a8abe7e8eeb2f661218ebf07280423034227f..05e066d73dad764c002f01295717fcbe6a242cfc 100644
--- a/chrome/browser/media/encrypted_media_supported_types_browsertest.cc
+++ b/chrome/browser/media/encrypted_media_supported_types_browsertest.cc
@@ -161,7 +161,6 @@ class EncryptedMediaSupportedTypesTest : public InProcessBrowserTest {
 
   void SetUpCommandLine(base::CommandLine* command_line) override {
     InProcessBrowserTest::SetUpCommandLine(command_line);
-    command_line->AppendSwitch(switches::kEnableVp9InMp4);
     command_line->AppendSwitch(switches::kEnableNewVp9CodecString);
   }