Change ppapi C++ comment style into C.

ppapi/c/dev/ppb_var_deprecated.h

Index: ppapi/c/dev/ppb_var_deprecated.h
diff --git a/ppapi/c/dev/ppb_var_deprecated.h b/ppapi/c/dev/ppb_var_deprecated.h
index 6dba7a043b687d9ff68ef588fedcb5f0ce32892d..19d7940a5fb4e191108ff2ce0543ecc1767762e7 100644
--- a/ppapi/c/dev/ppb_var_deprecated.h
+++ b/ppapi/c/dev/ppb_var_deprecated.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_PPB_VAR_DEPRECATED_H_
 #define PPAPI_C_PPB_VAR_DEPRECATED_H_
 
@@ -240,4 +240,5 @@ struct PPB_Var_Deprecated {
  * @}
  * End addtogroup PPB
  */
-#endif  // PPAPI_C_PPB_VAR_DEPRECATED_H_
+#endif  /* PPAPI_C_PPB_VAR_DEPRECATED_H_ */
+