PPAPI: Fix interface functions that take PP_CompletionCallbacks, but don't

webkit/plugins/ppapi/ppb_video_decoder_impl.h

Index: webkit/plugins/ppapi/ppb_video_decoder_impl.h
===================================================================
--- webkit/plugins/ppapi/ppb_video_decoder_impl.h	(revision 87397)
+++ webkit/plugins/ppapi/ppb_video_decoder_impl.h	(working copy)
@@ -46,16 +46,17 @@
                   PP_VideoConfigElement* matching_configs,
                   uint32_t matching_configs_size,
                   uint32_t* num_of_matching_configs);
-  bool Init(PP_VideoConfigElement* dec_config, PP_CompletionCallback callback);
-  bool Decode(PP_VideoBitstreamBuffer_Dev* bitstream_buffer,
-              PP_CompletionCallback callback);
+  int32_t Init(PP_VideoConfigElement* dec_config,
+               PP_CompletionCallback callback);
+  int32_t Decode(PP_VideoBitstreamBuffer_Dev* bitstream_buffer,
+                 PP_CompletionCallback callback);
   void AssignGLESBuffers(uint32_t no_of_buffers,
                          PP_GLESBuffer_Dev* buffers);
   void AssignSysmemBuffers(uint32_t no_of_buffers,
                            PP_SysmemBuffer_Dev* buffers);
   void ReusePictureBuffer(int32_t picture_buffer_id);
-  bool Flush(PP_CompletionCallback callback);
-  bool Abort(PP_CompletionCallback callback);
+  int32_t Flush(PP_CompletionCallback callback);
+  int32_t Abort(PP_CompletionCallback callback);
 
   // media::VideoDecodeAccelerator::Client implementation.
   virtual void ProvidePictureBuffers(