Add missing include guards in Cocoa code.

chrome/browser/ui/cocoa/infobars/translate_message_infobar_controller.h

Index: chrome/browser/ui/cocoa/infobars/translate_message_infobar_controller.h
diff --git a/chrome/browser/ui/cocoa/infobars/translate_message_infobar_controller.h b/chrome/browser/ui/cocoa/infobars/translate_message_infobar_controller.h
index 6a115fc883be401a7ed93c878577bcee37a3e25e..3210374adf10b395630a80b7992e211f7720f534 100644
--- a/chrome/browser/ui/cocoa/infobars/translate_message_infobar_controller.h
+++ b/chrome/browser/ui/cocoa/infobars/translate_message_infobar_controller.h
@@ -2,9 +2,14 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef CHROME_BROWSER_UI_COCOA_INFOBARS_TRANSLATE_MESSAGE_INFOBAR_CONTROLLER_H_
+#define CHROME_BROWSER_UI_COCOA_INFOBARS_TRANSLATE_MESSAGE_INFOBAR_CONTROLLER_H_
+
 #import "chrome/browser/ui/cocoa/infobars/translate_infobar_base.h"
 
 @interface TranslateMessageInfobarController : TranslateInfoBarControllerBase {
 }
 
 @end
+
+#endif  // CHROME_BROWSER_UI_COCOA_INFOBARS_TRANSLATE_MESSAGE_INFOBAR_CONTROLLER_H_