Enable vp09 codec string in WebM by default

media/base/media_switches.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Defines all the "media" command-line switches.
 
 #ifndef MEDIA_BASE_MEDIA_SWITCHES_H_
 #define MEDIA_BASE_MEDIA_SWITCHES_H_
 
 #include "base/feature_list.h"
@@ skipping 12 matching lines @@
 
 MEDIA_EXPORT extern const char kAutoplayPolicy[];
 
 MEDIA_EXPORT extern const char kVideoThreads[];
 
 MEDIA_EXPORT extern const char kEnableMediaSuspend[];
 MEDIA_EXPORT extern const char kDisableMediaSuspend[];
 
 MEDIA_EXPORT extern const char kReportVp9AsAnUnsupportedMimeType[];
 
-MEDIA_EXPORT extern const char kEnableNewVp9CodecString[];
-
 #if defined(OS_LINUX) || defined(OS_FREEBSD) || defined(OS_SOLARIS)
 MEDIA_EXPORT extern const char kAlsaInputDevice[];
 MEDIA_EXPORT extern const char kAlsaOutputDevice[];
 #endif
 
 #if defined(OS_WIN)
 MEDIA_EXPORT extern const char kEnableExclusiveAudio[];
 MEDIA_EXPORT extern const char kForceMediaFoundationVideoCapture[];
 MEDIA_EXPORT extern const char kForceWaveAudio[];
 MEDIA_EXPORT extern const char kTrySupportedChannelLayouts[];
@@ skipping 90 matching lines @@
 // autoplay policy. In other words, it will take into account the default policy
 // if none is specified via the command line and options passed for testing.
 // Returns one of the possible autoplay policy switches from the
 // switches::autoplay namespace.
 MEDIA_EXPORT std::string GetEffectiveAutoplayPolicy(
     const base::CommandLine& command_line);
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_MEDIA_SWITCHES_H_