Add missing include guards in Cocoa code.

chrome/browser/ui/cocoa/website_settings/website_settings_bubble_controller.h

Index: chrome/browser/ui/cocoa/website_settings/website_settings_bubble_controller.h
diff --git a/chrome/browser/ui/cocoa/website_settings/website_settings_bubble_controller.h b/chrome/browser/ui/cocoa/website_settings/website_settings_bubble_controller.h
index 721237d03654ac284d207647352f94e95591f361..9c9739fd639d0f75f92987898926bef6cc8f57f2 100644
--- a/chrome/browser/ui/cocoa/website_settings/website_settings_bubble_controller.h
+++ b/chrome/browser/ui/cocoa/website_settings/website_settings_bubble_controller.h
@@ -2,6 +2,9 @@
 // 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_WEBSITE_SETTINGS_WEBSITE_SETTINGS_BUBBLE_CONTROLLER_H_
+#define CHROME_BROWSER_UI_COCOA_WEBSITE_SETTINGS_WEBSITE_SETTINGS_BUBBLE_CONTROLLER_H_
+
 #import <Cocoa/Cocoa.h>
 
 #include <memory>
@@ -151,3 +154,5 @@ class WebsiteSettingsUIBridge : public content::WebContentsObserver,
 
   DISALLOW_COPY_AND_ASSIGN(WebsiteSettingsUIBridge);
 };
+
+#endif  // CHROME_BROWSER_UI_COCOA_WEBSITE_SETTINGS_WEBSITE_SETTINGS_BUBBLE_CONTROLLER_H_