Corresponding change in Pepper since EnumerateDevices contract is changed.

ppapi/proxy/ppb_audio_input_proxy.cc

Index: ppapi/proxy/ppb_audio_input_proxy.cc
===================================================================
--- ppapi/proxy/ppb_audio_input_proxy.cc	(revision 148913)
+++ ppapi/proxy/ppb_audio_input_proxy.cc	(working copy)
@@ -46,6 +46,7 @@
   virtual int32_t InternalEnumerateDevices(
       PP_Resource* devices,
       scoped_refptr<TrackedCallback> callback) OVERRIDE;
+  virtual int32_t InternalStopEnumerateDevices(PP_Resource* devices) OVERRIDE;
   virtual int32_t InternalOpen(
       const std::string& device_id,
       PP_AudioSampleRate sample_rate,
@@ -101,6 +102,14 @@
   return PP_OK_COMPLETIONPENDING;
 }
 
+int32_t AudioInput::InternalStopEnumerateDevices(PP_Resource* devices) {
+  if (devices_ == devices) {
+    GetDispatcher()->Send(new PpapiHostMsg_PPBAudioInput_EnumerateDevices(
+        API_ID_PPB_AUDIO_INPUT_DEV, host_resource()));
+  }
+  return PP_OK;
+}
+
 int32_t AudioInput::InternalOpen(const std::string& device_id,
                                  PP_AudioSampleRate sample_rate,
                                  uint32_t sample_frame_count,
@@ -187,6 +196,8 @@
     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBAudioInput_Create, OnMsgCreate)
     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBAudioInput_EnumerateDevices,
                         OnMsgEnumerateDevices)
+    IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBAudioInput_StopEnumerateDevices,
+                        OnMsgStopEnumerateDevices)
     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBAudioInput_Open, OnMsgOpen)
     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBAudioInput_StartOrStop,
                         OnMsgStartOrStop)
@@ -221,6 +232,13 @@
     enter.SetResult(enter.object()->EnumerateDevices(NULL, enter.callback()));
 }
 
+void PPB_AudioInput_Proxy::OnMsgStopEnumerateDevices(
+    const ppapi::HostResource& audio_input) {
+  EnterHostFromHostResource<PPB_AudioInput_API> enter(audio_input);
+  if (enter.succeeded())
+    enter.object()->StopEnumerateDevices(NULL);
+}
+
 void PPB_AudioInput_Proxy::OnMsgOpen(const ppapi::HostResource& audio_input,
                                      const std::string& device_id,
                                      int32_t sample_rate,