mac: Use immersive fullscreen for html5 style fullscreen.

chrome/browser/ui/cocoa/browser_window_controller.mm

 // Copyright 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.
 
 #import "chrome/browser/ui/cocoa/browser_window_controller.h"
 
 #include <cmath>
 #include <numeric>
 
 #include "base/command_line.h"
@@ skipping 2079 matching lines @@
   } else {
     // Need to invoke AppKit Fullscreen API. Presentation mode will
     // automatically be enabled in |-windowWillEnterFullScreen:|.
     enteringPresentationMode_ = YES;
     [self enterAppKitFullscreen];
   }
 }
 
 - (void)enterHTML5FullscreenForURL:(const GURL&)url
                         bubbleType:(FullscreenExitBubbleType)bubbleType {
-  if (!chrome::mac::SupportsSystemFullscreen()) {
-    [self enterImmersiveFullscreen];
-    if (!url.is_empty())
-      [self updateFullscreenExitBubbleURL:url bubbleType:bubbleType];
-  } else {
-    [self enterPresentationModeForURL:url bubbleType:bubbleType];
-  }
+  [self enterImmersiveFullscreen];
+  if (!url.is_empty())
+    [self updateFullscreenExitBubbleURL:url bubbleType:bubbleType];
 }
 
 - (void)exitAnyFullscreen {
   // TODO(erikchen): Fullscreen modes should stack. Should be able to exit
   // Immersive Fullscreen and still be in AppKit Fullscreen.
   if ([self isInAppKitFullscreen])
     [self exitAppKitFullscreen];
   if ([self isInImmersiveFullscreen])
     [self exitImmersiveFullscreen];
 }
@@ skipping 79 matching lines @@
 
 - (BOOL)supportsBookmarkBar {
   return [self supportsWindowFeature:Browser::FEATURE_BOOKMARKBAR];
 }
 
 - (BOOL)isTabbedWindow {
   return browser_->is_type_tabbed();
 }
 
 @end  // @implementation BrowserWindowController(WindowType)