Change ppapi C++ comment style into C.

ppapi/c/dev/ppb_video_decoder_dev.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_DEV_PPB_VIDEO_DECODER_DEV_H_
 #define PPAPI_C_DEV_PPB_VIDEO_DECODER_DEV_H_
 
 #include "ppapi/c/pp_bool.h"
 #include "ppapi/c/dev/pp_video_dev.h"
 #include "ppapi/c/pp_module.h"
 #include "ppapi/c/pp_resource.h"
 #include "ppapi/c/pp_stdint.h"
 #include "ppapi/c/pp_completion_callback.h"
 
@@ skipping 62 matching lines @@
   // flushing, the decode will call the |callback|.
   int32_t (*Flush)(PP_Resource decoder, struct PP_CompletionCallback callback);
 
   // Plugin sends uncompressed data buffers to the decoder.
   // Returns PP_TRUE on decoder successfully accepting the buffer, PP_FALSE
   // otherwise.
   PP_Bool (*ReturnUncompressedDataBuffer)(PP_Resource decoder,
       struct PP_VideoUncompressedDataBuffer_Dev* buffer);
 };
 
-#endif  // PPAPI_C_DEV_PPB_VIDEO_DECODER_DEV_H_
+#endif  /* PPAPI_C_DEV_PPB_VIDEO_DECODER_DEV_H_ */
+