Fix header guards in //chrome

chrome/browser/ui/cocoa/fullscreen/immersive_fullscreen_controller.h

 // Copyright 2016 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 CHROME_BROWSER_UI_COCOA_FULLSCREEN_IMMERSIVE_FULLSCREEN_CONTROLLER_H
-#define CHROME_BROWSER_UI_COCOA_FULLSCREEN_IMMERSIVE_FULLSCREEN_CONTROLLER_H
+#ifndef CHROME_BROWSER_UI_COCOA_FULLSCREEN_IMMERSIVE_FULLSCREEN_CONTROLLER_H_
+#define CHROME_BROWSER_UI_COCOA_FULLSCREEN_IMMERSIVE_FULLSCREEN_CONTROLLER_H_
 
 #import <Cocoa/Cocoa.h>
 
 @class BrowserWindowController;
 
 // This class manages the menubar and dock visibility for Immersive Fullscreen.
 // It uses a tracking area to show/hide the menubar if the user interacts with
 // the top of the screen.
 @interface ImmersiveFullscreenController : NSObject
 
 // Designated initializer.
 - (instancetype)initWithBrowserController:(BrowserWindowController*)bwc;
 
 // Updates the menubar and dock visibility according the state of the
 // immersive fullscreen.
 - (void)updateMenuBarAndDockVisibility;
 
 // Returns YES if the menubar should be shown in immersive fullscreen for the
 // screen that contains the window.
 - (BOOL)shouldShowMenubar;
 
 @end
 
-#endif  // CHROME_BROWSER_UI_COCOA_FULLSCREEN_IMMERSIVE_FULLSCREEN_CONTROLLER_H
+#endif  // CHROME_BROWSER_UI_COCOA_FULLSCREEN_IMMERSIVE_FULLSCREEN_CONTROLLER_H_