PPAPI: Make blocking completion callbacks work.

ppapi/thunk/ppb_audio_input_api.h

Index: ppapi/thunk/ppb_audio_input_api.h
diff --git a/ppapi/thunk/ppb_audio_input_api.h b/ppapi/thunk/ppb_audio_input_api.h
index 38e94ef650ce54d4092a32d0dd75a10d06ea794b..f98bbac7ce5e1864ade90150ece29eb2b55ccf9b 100644
--- a/ppapi/thunk/ppb_audio_input_api.h
+++ b/ppapi/thunk/ppb_audio_input_api.h
@@ -10,6 +10,7 @@
 
 #include "ppapi/c/dev/ppb_audio_input_dev.h"
 #include "ppapi/c/pp_completion_callback.h"
+#include "ppapi/shared_impl/api_callback_type.h"
 #include "ppapi/thunk/ppapi_thunk_export.h"
 
 namespace ppapi {
@@ -22,24 +23,22 @@ class PPAPI_THUNK_EXPORT PPB_AudioInput_API {
  public:
   virtual ~PPB_AudioInput_API() {}
 
-  virtual int32_t EnumerateDevices(
-      PP_Resource* devices,
-      const PP_CompletionCallback& callback) = 0;
+  virtual int32_t EnumerateDevices(PP_Resource* devices,
+                                   ApiCallbackType callback) = 0;
   virtual int32_t Open(const std::string& device_id,
                        PP_Resource config,
                        PPB_AudioInput_Callback audio_input_callback,
                        void* user_data,
-                       const PP_CompletionCallback& callback) = 0;
+                       ApiCallbackType callback) = 0;
   virtual PP_Resource GetCurrentConfig() = 0;
   virtual PP_Bool StartCapture() = 0;
   virtual PP_Bool StopCapture() = 0;
   virtual void Close() = 0;
 
   // Trusted API.
-  virtual int32_t OpenTrusted(
-      const std::string& device_id,
-      PP_Resource config,
-      const PP_CompletionCallback& create_callback) = 0;
+  virtual int32_t OpenTrusted(const std::string& device_id,
+                              PP_Resource config,
+                              ApiCallbackType create_callback) = 0;
   virtual int32_t GetSyncSocket(int* sync_socket) = 0;
   virtual int32_t GetSharedMemory(int* shm_handle, uint32_t* shm_size) = 0;
   virtual const std::vector<DeviceRefData>& GetDeviceRefData() const = 0;