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

ppapi/cpp/dev/video_capture_client_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_CAPTURE_CLIENT_DEV_H_
 #define PPAPI_CPP_DEV_VIDEO_CAPTURE_CLIENT_DEV_H_
 
 #include <vector>
 
 #include "ppapi/c/dev/pp_video_capture_dev.h"
 #include "ppapi/cpp/dev/buffer_dev.h"
+#include "ppapi/cpp/instance_handle.h"
 #include "ppapi/cpp/resource.h"
 
 namespace pp {
 
-class Instance;
-
 class VideoCaptureClient_Dev {
  public:
-  explicit VideoCaptureClient_Dev(Instance* instance);
+  explicit VideoCaptureClient_Dev(const InstanceHandle& instance);
   virtual ~VideoCaptureClient_Dev();
 
   virtual void OnDeviceInfo(PP_Resource video_capture,
                             const PP_VideoCaptureDeviceInfo_Dev& info,
                             const std::vector<Buffer_Dev>& buffers) = 0;
   virtual void OnStatus(PP_Resource video_capture, uint32_t status) = 0;
   virtual void OnError(PP_Resource video_capture, uint32_t error) = 0;
   virtual void OnBufferReady(PP_Resource video_capture, uint32_t buffer) = 0;
 
  private:
-  Instance* instance_;
+  InstanceHandle instance_;
 };
 
 }  // namespace pp
 
 #endif  // PPAPI_CPP_DEV_VIDEO_CAPTURE_CLIENT_DEV_H_