Convert resources to take an instance key instead of an Instance*.

ppapi/cpp/dev/video_decoder_dev.h

 // Copyright (c) 2011 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 PPAPI_CPP_DEV_VIDEO_DECODER_DEV_H_
 #define PPAPI_CPP_DEV_VIDEO_DECODER_DEV_H_
 
 #include <vector>
 
 #include "ppapi/c/dev/pp_video_dev.h"
 #include "ppapi/cpp/completion_callback.h"
 #include "ppapi/cpp/dev/buffer_dev.h"
 #include "ppapi/cpp/resource.h"
 
 namespace pp {
 
 class Graphics3D;
-class Instance;
+class InstanceHandle;
 
 // C++ wrapper for the Pepper Video Decoder interface. For more detailed
 // documentation refer to the C interfaces.
 //
 // C++ version of the PPB_VideoDecoder_Dev interface.
 class VideoDecoder_Dev : public Resource {
  public:
   // See PPB_VideoDecoder_Dev::Create.
-  VideoDecoder_Dev(const Instance* instance,
+  VideoDecoder_Dev(const InstanceHandle& instance,
                    const Graphics3D& context,
                    PP_VideoDecoder_Profile profile);
 
   explicit VideoDecoder_Dev(PP_Resource resource);
   virtual ~VideoDecoder_Dev();
 
   // PPB_VideoDecoder_Dev implementation.
   void AssignPictureBuffers(const std::vector<PP_PictureBuffer_Dev>& buffers);
   int32_t Decode(const PP_VideoBitstreamBuffer_Dev& bitstream_buffer,
                  CompletionCallback callback);
   void ReusePictureBuffer(int32_t picture_buffer_id);
   int32_t Flush(CompletionCallback callback);
   int32_t Reset(const CompletionCallback& callback);
 
  private:
   // Disallow copy-construction to ensure Destroy() is called exactly once.
   VideoDecoder_Dev(const VideoDecoder_Dev&);
 };
 
 }  // namespace pp
 
 #endif  // PPAPI_CPP_DEV_VIDEO_DECODER_DEV_H_