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

ppapi/cpp/audio_config.h

Index: ppapi/cpp/audio_config.h
diff --git a/ppapi/cpp/audio_config.h b/ppapi/cpp/audio_config.h
index ff1d25648c07e666849d3f492aaf903f7ae2246b..e8c47ab12167968808adcb9f7a02abc4cc0b9c8b 100644
--- a/ppapi/cpp/audio_config.h
+++ b/ppapi/cpp/audio_config.h
@@ -16,7 +16,7 @@
 
 namespace pp {
 
-class Instance;
+class InstanceHandle;
 
 /// A 16 bit stereo AudioConfig resource. Refer to the
 /// <a href="/chrome/nativeclient/docs/audio.html">Pepper
@@ -64,21 +64,24 @@ class AudioConfig : public Resource {
   /// resulting resource will be is_null(). You can pass the result of
   /// RecommendSampleFrameCount() as the sample frame count.
   ///
-  /// @param[in] instance A pointer to an <code>Instance</code> identifying
-  /// one instance of a module.
+  /// @param[in] instance The instance with which this resource will be
+  /// associated.
+  ///
   /// @param[in] sample_rate A <code>PP_AudioSampleRate</code> which is either
   /// <code>PP_AUDIOSAMPLERATE_44100</code> or
   /// <code>PP_AUDIOSAMPLERATE_48000</code>.
+  ///
   /// @param[in] sample_frame_count A uint32_t frame count returned from the
   /// <code>RecommendSampleFrameCount</code> function.
-  AudioConfig(Instance* instance,
+  AudioConfig(const InstanceHandle& instance,
               PP_AudioSampleRate sample_rate,
               uint32_t sample_frame_count);
 
   /// RecommendSampleRate() returns the native sample rate used by the
   /// audio system.  Applications that use the recommended sample rate might
   /// obtain lower latency and higher fidelity output.
-  static PP_AudioSampleRate RecommendSampleRate(Instance* instance);
+  static PP_AudioSampleRate RecommendSampleRate(
+      const InstanceHandle& instance);
 
   /// RecommendSampleFrameCount() returns a supported frame count closest to
   /// the requested count. The sample frame count determines the overall
@@ -92,8 +95,6 @@ class AudioConfig : public Resource {
   /// will return a supported count closest to the requested value for use in
   /// the constructor.
   ///
-  /// @param[in] instance A pointer to an <code>Instance</code> identifying
-  /// one instance of a module.
   /// @param[in] sample_rate A <code>PP_AudioSampleRate</code> which is either
   /// <code>PP_AUDIOSAMPLERATE_44100</code> or
   /// <code>PP_AUDIOSAMPLERATE_48000</code>.
@@ -103,7 +104,7 @@ class AudioConfig : public Resource {
   /// successful. If the sample frame count or bit rate is not supported,
   /// this function will fail and return 0.
   static uint32_t RecommendSampleFrameCount(
-      Instance* instance,
+      const InstanceHandle& instance,
       PP_AudioSampleRate sample_rate,
       uint32_t requested_sample_frame_count);