Corresponding change in Pepper since EnumerateDevices contract is changed.

ppapi/shared_impl/ppb_audio_input_shared.h

Index: ppapi/shared_impl/ppb_audio_input_shared.h
===================================================================
--- ppapi/shared_impl/ppb_audio_input_shared.h	(revision 148913)
+++ ppapi/shared_impl/ppb_audio_input_shared.h	(working copy)
@@ -42,6 +42,7 @@
   virtual int32_t EnumerateDevices(
       PP_Resource* devices,
       scoped_refptr<TrackedCallback> callback) OVERRIDE;
+  virtual int32_t StopEnumerateDevices(PP_Resource* devices) OVERRIDE;
   virtual int32_t Open(const std::string& device_id,
                        PP_Resource config,
                        PPB_AudioInput_Callback audio_input_callback,
@@ -74,6 +75,7 @@
   virtual int32_t InternalEnumerateDevices(
       PP_Resource* devices,
       scoped_refptr<TrackedCallback> callback) = 0;
+  virtual int32_t InternalStopEnumerateDevices(PP_Resource* devices) = 0;
   virtual int32_t InternalOpen(const std::string& device_id,
                                PP_AudioSampleRate sample_rate,
                                uint32_t sample_frame_count,
@@ -155,8 +157,9 @@
   ScopedPPResource config_;
 
   // Output parameter of EnumerateDevices(). It should not be accessed after
-  // |enumerate_devices_callback_| is run.
+  // StopEnumerateDevices is called.
   PP_Resource* devices_;
+  int enumeration_request_id_;
 
   ResourceObjectType resource_object_type_;