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

media/filters/vpx_video_decoder.cc

 // 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.
 
 #include "media/filters/vpx_video_decoder.h"
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "base/command_line.h"
 #include "base/location.h"
@@ skipping 105 matching lines @@
   }
   return context;
 }
 
 bool VpxVideoDecoder::ConfigureDecoder() {
   const VideoDecoderConfig& config = demuxer_stream_->video_decoder_config();
   DCHECK(config.IsValidConfig());
 
   const CommandLine* cmd_line = CommandLine::ForCurrentProcess();
   bool can_handle = false;
-  if (cmd_line->HasSwitch(switches::kEnableVp9Playback) &&
-      config.codec() == kCodecVP9) {
+  if (config.codec() == kCodecVP9)
     can_handle = true;
-  }
   if (cmd_line->HasSwitch(switches::kEnableVp8AlphaPlayback) &&
       config.codec() == kCodecVP8 && config.format() == VideoFrame::YV12A) {
     can_handle = true;
   }
   if (!can_handle)
     return false;
 
   CloseDecoder();
 
   vpx_codec_ = InitializeVpxContext(vpx_codec_, config);
@@ skipping 271 matching lines @@
         vpx_image->stride[VPX_PLANE_Y], vpx_image->d_h, video_frame->get());
     return;
   }
   CopyAPlane(vpx_image_alpha->planes[VPX_PLANE_Y],
              vpx_image->stride[VPX_PLANE_Y],
              vpx_image->d_h,
              video_frame->get());
 }
 
 }  // namespace media