Replace VideoRendererImpl's kError state with a CHECK().

media/filters/video_renderer_impl.h

 // Copyright 2013 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.
 
 #ifndef MEDIA_FILTERS_VIDEO_RENDERER_IMPL_H_
 #define MEDIA_FILTERS_VIDEO_RENDERER_IMPL_H_
 
 #include <deque>
 
 #include "base/memory/ref_counted.h"
@@ skipping 136 matching lines @@
   // Keeps track of whether we received the end of stream buffer and finished
   // rendering.
   bool received_end_of_stream_;
   bool rendered_end_of_stream_;
 
   // Used to signal |thread_| as frames are added to |frames_|.  Rule of thumb:
   // always check |state_| to see if it was set to STOPPED after waking up!
   base::ConditionVariable frame_available_;
 
   // State transition Diagram of this class:
-  //       [kUninitialized] -------> [kError]
+  //       [kUninitialized]
   //              |
   //              | Initialize()
   //        [kInitializing]
   //              |
   //              V
   //   +------[kFlushed]<---------------OnVideoFrameStreamResetDone()
   //   |          | Preroll() or upon               ^
   //   |          V got first frame            [kFlushing]
   //   |      [kPrerolling]                         ^
   //   |          |                                 | Flush()
   //   |          V Got enough frames               |
   //   |      [kPrerolled]---------------------->[kPaused]
   //   |          |                Pause()          ^
   //   |          V Play()                          |
   //   |       [kPlaying]---------------------------|
   //   |                           Pause()          ^ Pause()
   //   |                                            |
   //   +-----> [kStopped]                 [Any state other than]
-  //                                      [kUninitialized/kError]
+  //                                      [   kUninitialized   ]
 
   // Simple state tracking variable.
   enum State {
     kUninitialized,
     kInitializing,
     kPrerolled,
     kPaused,
     kFlushing,
     kFlushed,
     kPrerolling,
     kPlaying,
     kStopped,
-    kError,
   };
   State state_;
 
   // Video thread handle.
   base::PlatformThreadHandle thread_;
 
   // Keep track of the outstanding read on the VideoFrameStream. Flushing can
   // only complete once the read has completed.
   bool pending_read_;
 
@@ skipping 31 matching lines @@
 
   // NOTE: Weak pointers must be invalidated before all other member variables.
   base::WeakPtrFactory<VideoRendererImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(VideoRendererImpl);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_VIDEO_RENDERER_IMPL_H_