[Mac] Refactor Immersive Fullscreen Logic

chrome/browser/ui/cocoa/browser_window_controller_private.mm

 // 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.
 
 #import "chrome/browser/ui/cocoa/browser_window_controller_private.h"
 
 #include <cmath>
 
 #import "base/auto_reset.h"
 #include "base/command_line.h"
@@ skipping 570 matching lines @@
       removeObserver:self
                 name:NSViewFrameDidChangeNotification
               object:[[self window] contentView]];
 }
 
 - (NSSize)window:(NSWindow*)window
     willUseFullScreenContentSize:(NSSize)proposedSize {
   return proposedSize;
 }
 
-- (NSApplicationPresentationOptions)window:(NSWindow*)window
-    willUseFullScreenPresentationOptions:(NSApplicationPresentationOptions)opt {
-  return (opt |
-          NSApplicationPresentationAutoHideDock |
-          NSApplicationPresentationAutoHideMenuBar);
-}
-
 - (void)windowWillEnterFullScreen:(NSNotification*)notification {
   RecordFullscreenWindowLocation([self window]);
   RecordFullscreenStyle(CANONICAL_FULLSCREEN);
 
   if (notification)  // For System Fullscreen when non-nil.
     [self registerForContentViewResizeNotifications];
 
   [[tabStripController_ activeTabContentsController]
       setBlockFullscreenResize:YES];
 
@@ skipping 576 matching lines @@
   if (fullscreenLowPowerCoordinator_)
     fullscreenLowPowerCoordinator_->SetHasActiveSheet(false);
 }
 
 - (void)childWindowsDidChange {
   if (fullscreenLowPowerCoordinator_)
     fullscreenLowPowerCoordinator_->ChildWindowsChanged();
 }
 
 @end  // @implementation BrowserWindowController(Private)