Change ppapi C++ comment style into C.

ppapi/c/pp_completion_callback.h

-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
+/* Copyright (c) 2010 The Chromium Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
 #ifndef PPAPI_C_PP_COMPLETION_CALLBACK_H_
 #define PPAPI_C_PP_COMPLETION_CALLBACK_H_
 
 /**
  * @file
  * Defines the API ...
  *
  * @addtogroup PP
  * @{
  */
@@ skipping 18 matching lines @@
  * value then it may carry additional information.
  */
 struct PP_CompletionCallback {
   PP_CompletionCallback_Func func;
   void* user_data;
 };
 
 PP_INLINE struct PP_CompletionCallback PP_MakeCompletionCallback(
     PP_CompletionCallback_Func func,
     void* user_data) {
-  struct PP_CompletionCallback cc = { func, user_data };
+  struct PP_CompletionCallback cc;
+  cc.func = func;
+  cc.user_data = user_data;
   return cc;
 }
 
 PP_INLINE void PP_RunCompletionCallback(struct PP_CompletionCallback* cc,
                                         int32_t res) {
   cc->func(cc->user_data, res);
 }
 
 /**
  * Use this in place of an actual completion callback to request blocking
  * behavior.  If specified, the calling thread will block until a method
  *  completes.  This is only usable from background threads.
  */
 PP_INLINE struct PP_CompletionCallback PP_BlockUntilComplete() {
   return PP_MakeCompletionCallback(NULL, NULL);
 }
 
 /**
  * @}
  * End of addtogroup PP
  */
-#endif  // PPAPI_C_PP_COMPLETION_CALLBACK_H_
+#endif  /* PPAPI_C_PP_COMPLETION_CALLBACK_H_ */
+