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

ppapi/cpp/audio_config.cc

Index: ppapi/cpp/audio_config.cc
diff --git a/ppapi/cpp/audio_config.cc b/ppapi/cpp/audio_config.cc
index a49515e49b308ddfdf58f7ab73ed82bf0bed4b44..ef03922c05c8123580a58a3e89780b18a4a561df 100644
--- a/ppapi/cpp/audio_config.cc
+++ b/ppapi/cpp/audio_config.cc
@@ -4,7 +4,7 @@
 
 #include "ppapi/cpp/audio_config.h"
 
-#include "ppapi/cpp/instance.h"
+#include "ppapi/cpp/instance_handle.h"
 #include "ppapi/cpp/module.h"
 #include "ppapi/cpp/module_impl.h"
 
@@ -23,7 +23,7 @@ AudioConfig::AudioConfig()
       sample_frame_count_(0) {
 }
 
-AudioConfig::AudioConfig(Instance* instance,
+AudioConfig::AudioConfig(const InstanceHandle& instance,
                          PP_AudioSampleRate sample_rate,
                          uint32_t sample_frame_count)
     : sample_rate_(sample_rate),
@@ -31,27 +31,28 @@ AudioConfig::AudioConfig(Instance* instance,
   if (has_interface<PPB_AudioConfig>()) {
     PassRefFromConstructor(
         get_interface<PPB_AudioConfig>()->CreateStereo16Bit(
-        instance->pp_instance(), sample_rate, sample_frame_count));
+        instance.pp_instance(), sample_rate, sample_frame_count));
   }
 }
 
 // static
-PP_AudioSampleRate AudioConfig::RecommendSampleRate(Instance* instance) {
+PP_AudioSampleRate AudioConfig::RecommendSampleRate(
+    const InstanceHandle& instance) {
   if (!has_interface<PPB_AudioConfig>())
     return PP_AUDIOSAMPLERATE_NONE;
   return get_interface<PPB_AudioConfig>()->
-      RecommendSampleRate(instance->pp_instance());
+      RecommendSampleRate(instance.pp_instance());
 }
 
 // static
 uint32_t AudioConfig::RecommendSampleFrameCount(
-    Instance* instance,
+    const InstanceHandle& instance,
     PP_AudioSampleRate sample_rate,
     uint32_t requested_sample_frame_count) {
   if (!has_interface<PPB_AudioConfig>())
     return 0;
   return get_interface<PPB_AudioConfig>()->
-      RecommendSampleFrameCount(instance->pp_instance(),
+      RecommendSampleFrameCount(instance.pp_instance(),
                                 sample_rate,
                                 requested_sample_frame_count);
 }