Change ppapi C++ comment style into C.

ppapi/c/dev/ppb_char_set_dev.h

Index: ppapi/c/dev/ppb_char_set_dev.h
diff --git a/ppapi/c/dev/ppb_char_set_dev.h b/ppapi/c/dev/ppb_char_set_dev.h
index 03cfa87a4ce98f44da38e2ea39010120d9db38cb..74c1ca59cf00974356d15f4b247fadec44c076a9 100644
--- a/ppapi/c/dev/ppb_char_set_dev.h
+++ b/ppapi/c/dev/ppb_char_set_dev.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_DEV_PPB_CHAR_SET_DEV_H_
 #define PPAPI_C_DEV_PPB_CHAR_SET_DEV_H_
 
@@ -77,4 +77,5 @@ struct PPB_CharSet_Dev {
   struct PP_Var (*GetDefaultCharSet)(PP_Module module);
 };
 
-#endif  // PPAPI_C_DEV_PPB_CHAR_SET_DEV_H_
+#endif  /* PPAPI_C_DEV_PPB_CHAR_SET_DEV_H_ */
+