Change ppapi C++ comment style into C.

ppapi/c/trusted/ppb_image_data_trusted.h

Index: ppapi/c/trusted/ppb_image_data_trusted.h
diff --git a/ppapi/c/trusted/ppb_image_data_trusted.h b/ppapi/c/trusted/ppb_image_data_trusted.h
index 9d2f3a73065807caf34a09eaa988371b52339eae..c8ad889a2152a97ea6889564b2d98e6b8754866c 100644
--- a/ppapi/c/trusted/ppb_image_data_trusted.h
+++ b/ppapi/c/trusted/ppb_image_data_trusted.h
@@ -1,7 +1,7 @@
-// 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_TRUSTED_PPB_IMAGE_DATA_TRUSTED_H_
 #define PPAPI_C_TRUSTED_PPB_IMAGE_DATA_TRUSTED_H_
 
@@ -24,3 +24,4 @@ struct PPB_ImageDataTrusted {
 };
 
 #endif  // PPAPI_C_TRUSTED_PPB_IMAGE_DATA_TRUSTED_H_
+