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

ppapi/cpp/dev/audio_input_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_AUDIO_INPUT_DEV_H_
 #define PPAPI_CPP_DEV_AUDIO_INPUT_DEV_H_
 
 #include "ppapi/c/dev/ppb_audio_input_dev.h"
 #include "ppapi/cpp/audio_config.h"
 #include "ppapi/cpp/resource.h"
 
 namespace pp {
 
-class Instance;
+class InstanceHandle;
 
 class AudioInput_Dev : public Resource {
  public:
   /// An empty constructor for an AudioInput resource.
   AudioInput_Dev() {}
 
-  AudioInput_Dev(Instance* instance,
+  AudioInput_Dev(const InstanceHandle& instance,
                  const AudioConfig& config,
                  PPB_AudioInput_Callback callback,
                  void* user_data);
 
   /// Static function for determining whether the browser supports the required
   /// AudioInput interface.
   ///
   /// @return true if the interface is available, false otherwise.
   static bool IsAvailable();
 
@@ skipping 13 matching lines @@
   bool StartCapture();
   bool StopCapture();
 
  private:
   AudioConfig config_;
 };
 
 }  // namespace pp
 
 #endif  // PPAPI_CPP_DEV_AUDIO_INPUT_DEV_H_