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

ppapi/cpp/audio.cc

 // 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.
 
 #include "ppapi/cpp/audio.h"
 
+#include "ppapi/cpp/instance_handle.h"
 #include "ppapi/cpp/module_impl.h"
 
 namespace pp {
 
 namespace {
 
 template <> const char* interface_name<PPB_Audio>() {
   return PPB_AUDIO_INTERFACE;
 }
 
 }  // namespace
 
-Audio::Audio(Instance* instance,
+Audio::Audio(const InstanceHandle& instance,
              const AudioConfig& config,
              PPB_Audio_Callback callback,
              void* user_data)
     : config_(config) {
   if (has_interface<PPB_Audio>()) {
     PassRefFromConstructor(get_interface<PPB_Audio>()->Create(
-        instance->pp_instance(), config.pp_resource(), callback, user_data));
+        instance.pp_instance(), config.pp_resource(), callback, user_data));
   }
 }
 
 bool Audio::StartPlayback() {
   return has_interface<PPB_Audio>() &&
       get_interface<PPB_Audio>()->StartPlayback(pp_resource());
 }
 
 bool Audio::StopPlayback() {
   return has_interface<PPB_Audio>() &&
       get_interface<PPB_Audio>()->StopPlayback(pp_resource());
 }
 
 }  // namespace pp