mac: Use immersive fullscreen for html5 style fullscreen.

chrome/browser/ui/cocoa/browser_window_controller.h

 // Copyright (c) 2012 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_BROWSER_WINDOW_CONTROLLER_H_
 #define CHROME_BROWSER_UI_COCOA_BROWSER_WINDOW_CONTROLLER_H_
 
 // A class acting as the Objective-C controller for the Browser
 // object. Handles interactions between Cocoa and the cross-platform
 // code. Each window has a single toolbar and, by virtue of being a
@@ skipping 477 matching lines @@
 - (BOOL)isInAppKitFullscreen;
 
 // Returns YES if the PresentationModeController exists and hence the omnibox
 // and other UI is expected to slide.
 - (BOOL)isInFullscreenWithOmniboxSliding;
 
 // Enters (or exits) presentation mode.
 - (void)enterPresentationModeForURL:(const GURL&)url
                          bubbleType:(FullscreenExitBubbleType)bubbleType;
 
-// Tries to use AppKit Fullscreen, falls back to Immersive Fullscreen.
+// Enters Immersive Fullscreen for the given URL.
 - (void)enterHTML5FullscreenForURL:(const GURL&)url
                         bubbleType:(FullscreenExitBubbleType)bubbleType;
 
 // Exits the current fullscreen mode.
 - (void)exitAnyFullscreen;
 
 // Whether the system is in the very specific fullscreen mode: Presentation
 // Mode.
 - (BOOL)inPresentationMode;
 
@@ skipping 66 matching lines @@
 // positioned relative to.
 - (NSRect)omniboxPopupAnchorRect;
 
 // Force a layout of info bars.
 - (void)layoutInfoBars;
 
 @end  // @interface BrowserWindowController (TestingAPI)
 
 
 #endif  // CHROME_BROWSER_UI_COCOA_BROWSER_WINDOW_CONTROLLER_H_