PPAPI: Make blocking completion callbacks work.

webkit/plugins/ppapi/ppb_directory_reader_impl.h

Index: webkit/plugins/ppapi/ppb_directory_reader_impl.h
diff --git a/webkit/plugins/ppapi/ppb_directory_reader_impl.h b/webkit/plugins/ppapi/ppb_directory_reader_impl.h
index b7cae31ad008ccf7885c4dccdafc184f698d9b41..dfce2c37db7c20b2b4042f810d74c5c870d9d118 100644
--- a/webkit/plugins/ppapi/ppb_directory_reader_impl.h
+++ b/webkit/plugins/ppapi/ppb_directory_reader_impl.h
@@ -12,7 +12,6 @@
 #include "ppapi/shared_impl/resource.h"
 #include "ppapi/thunk/ppb_directory_reader_api.h"
 
-struct PP_CompletionCallback;
 struct PP_DirectoryEntry_Dev;
 
 namespace webkit {
@@ -35,7 +34,7 @@ class PPB_DirectoryReader_Impl
 
   // PPB_DirectoryReader_API implementation.
   virtual int32_t GetNextEntry(PP_DirectoryEntry_Dev* entry,
-                               PP_CompletionCallback callback) OVERRIDE;
+                               ::ppapi::ApiCallbackType callback) OVERRIDE;
 
   void AddNewEntries(const std::vector<base::FileUtilProxy::Entry>& entries,
                      bool has_more);