[Mac] Allow fullscreen transitions while constrained windows are open.

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 2065 matching lines @@
 }
 
 // Called to transition into or out of fullscreen mode. Only use System
 // Fullscreen mode if the system supports it and we aren't trying to go
 // fullscreen for the renderer-initiated use cases.
 // Discussion: http://crbug.com/179181 and http:/crbug.com/351252
 - (void)setFullscreen:(BOOL)fullscreen {
   if (fullscreen == [self isFullscreen])
     return;
 
-  if (!chrome::IsCommandEnabled(browser_.get(), IDC_FULLSCREEN))
-    return;
-
   if (fullscreen) {
     const BOOL shouldUseSystemFullscreen =
         chrome::mac::SupportsSystemFullscreen() && !fullscreenWindow_ &&
         !browser_->fullscreen_controller()->IsWindowFullscreenForTabOrPending();
     if (shouldUseSystemFullscreen) {
       if (FramedBrowserWindow* framedBrowserWindow =
           base::mac::ObjCCast<FramedBrowserWindow>([self window])) {
         [framedBrowserWindow toggleSystemFullScreen];
       }
     } else {
@@ skipping 209 matching lines @@
 
 - (BOOL)supportsBookmarkBar {
   return [self supportsWindowFeature:Browser::FEATURE_BOOKMARKBAR];
 }
 
 - (BOOL)isTabbedWindow {
   return browser_->is_type_tabbed();
 }
 
 @end  // @implementation BrowserWindowController(WindowType)