Revert of Merge VideoDecodeAcceleratorImpl with VideoDecodeAccelerator

content/common/gpu/media/vaapi_video_decode_accelerator.h

Index: content/common/gpu/media/vaapi_video_decode_accelerator.h
diff --git a/content/common/gpu/media/vaapi_video_decode_accelerator.h b/content/common/gpu/media/vaapi_video_decode_accelerator.h
index 2bde3e0cef75a83e99b2166fdf772137a66460f2..37b9c7fb013016da5737a724711db1f31e930729 100644
--- a/content/common/gpu/media/vaapi_video_decode_accelerator.h
+++ b/content/common/gpu/media/vaapi_video_decode_accelerator.h
@@ -25,6 +25,7 @@
 #include "content/common/content_export.h"
 #include "content/common/gpu/media/vaapi_h264_decoder.h"
 #include "content/common/gpu/media/vaapi_wrapper.h"
+#include "content/common/gpu/media/video_decode_accelerator_impl.h"
 #include "media/base/bitstream_buffer.h"
 #include "media/video/picture.h"
 #include "media/video/video_decode_accelerator.h"
@@ -41,7 +42,7 @@
 // stopped during |this->Destroy()|, so any tasks posted to the decoder thread
 // can assume |*this| is still alive.  See |weak_this_| below for more details.
 class CONTENT_EXPORT VaapiVideoDecodeAccelerator
-    : public media::VideoDecodeAccelerator {
+    : public VideoDecodeAcceleratorImpl {
  public:
   VaapiVideoDecodeAccelerator(
       Display* x_display,
@@ -58,7 +59,6 @@
   virtual void Flush() OVERRIDE;
   virtual void Reset() OVERRIDE;
   virtual void Destroy() OVERRIDE;
-  virtual bool CanDecodeOnIOThread() OVERRIDE;
 
 private:
   // Notify the client that an error has occurred and decoding cannot continue.