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

ppapi/cpp/dev/video_capture_dev.h

 // Copyright (c) 2012 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_DEV_H_
 #define PPAPI_CPP_DEV_VIDEO_CAPTURE_DEV_H_
 
 #include <vector>
 
 #include "ppapi/c/dev/pp_video_capture_dev.h"
 #include "ppapi/cpp/resource.h"
 
 namespace pp {
 
 class CompletionCallback;
 class DeviceRef_Dev;
-class Instance;
+class InstanceHandle;
 
 class VideoCapture_Dev : public Resource {
  public:
-  explicit VideoCapture_Dev(const Instance& instance);
+  explicit VideoCapture_Dev(const InstanceHandle& instance);
   VideoCapture_Dev(PP_Resource resource);
   VideoCapture_Dev(const VideoCapture_Dev& other);
 
   virtual ~VideoCapture_Dev();
 
   VideoCapture_Dev& operator=(const VideoCapture_Dev& other);
 
   // Returns true if the required interface is available.
   static bool IsAvailable();
 
@@ skipping 19 matching lines @@
   // responsibility to delete it.
   static void OnEnumerateDevicesComplete(void* user_data, int32_t result);
 
   // Not owned by this object.
   EnumerateDevicesState* enum_state_;
 };
 
 }  // namespace pp
 
 #endif  // PPAPI_CPP_DEV_VIDEO_CAPTURE_DEV_H_