Add a unified resource tracker shared between the proxy and the impl.

ppapi/shared_impl/video_decoder_impl.h

Index: ppapi/shared_impl/video_decoder_impl.h
diff --git a/ppapi/shared_impl/video_decoder_impl.h b/ppapi/shared_impl/video_decoder_impl.h
index 6cd8044c8cbe9a1fa54c007a51b1410afbe8742c..191efa92dd58f5360d33b178a06ff1c142e8e4d7 100644
--- a/ppapi/shared_impl/video_decoder_impl.h
+++ b/ppapi/shared_impl/video_decoder_impl.h
@@ -11,7 +11,7 @@
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "ppapi/c/dev/ppb_video_decoder_dev.h"
-#include "ppapi/shared_impl/resource_object_base.h"
+#include "ppapi/shared_impl/resource.h"
 #include "ppapi/thunk/ppb_video_decoder_api.h"
 
 namespace gpu {
@@ -61,11 +61,6 @@ class VideoDecoderImpl : public thunk::PPB_VideoDecoder_API {
                     thunk::PPB_Context3D_API* context,
                     const PP_VideoConfigElement* dec_config);
 
-  // TODO(fischman/vrk): Remove accordingly when brettw has merged resource
-  // trackers.
-  virtual void AddRefResource(PP_Resource resource) = 0;
-  virtual void UnrefResource(PP_Resource resource) = 0;
-
  private:
   // Key: bitstream_buffer_id, value: callback to run when bitstream decode is
   // done.