Hide mac background mode prefs ui if background mode is not enabled.

chrome/browser/cocoa/preferences_window_controller.mm

 // Copyright (c) 2010 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/cocoa/preferences_window_controller.h"
 
 #include <algorithm>
 
 #include "app/l10n_util.h"
 #include "app/l10n_util_mac.h"
@@ skipping 516 matching lines @@
             [underTheHoodScroller_ contentSize].width)
       << "The Under the Hood content should be narrower than the content "
          "of the scroller it goes into";
 
 #if !defined(GOOGLE_CHROME_BUILD)
   // "Enable logging" (breakpad and stats) is only in Google Chrome builds,
   // remove the checkbox and slide everything above it down.
   RemoveViewFromView(underTheHoodContentView_, enableLoggingCheckbox_);
 #endif  // !defined(GOOGLE_CHROME_BUILD)
 
+  // If BackgroundMode is not enabled, hide the related prefs UI.
+  if (!CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kEnableBackgroundMode)) {
+    RemoveViewFromView(underTheHoodContentView_, backgroundModeTitle_);
+    RemoveViewFromView(underTheHoodContentView_, backgroundModeCheckbox_);
+    RemoveViewFromView(underTheHoodContentView_, backgroundModeDescription_);
+    RemoveViewFromView(underTheHoodContentView_, backgroundModeLearnMore_);
+  }
+
   // There are four problem children within the groups:
   //   Basics - Default Browser
   //   Personal Stuff - Sync
   //   Personal Stuff - Themes
   //   Personal Stuff - Browser Data
   // These four have buttons that with some localizations are wider then the
   // view.  So the four get manually laid out before doing the general work so
   // the views/window can be made wide enough to fit them.  The layout in the
   // general pass is a noop for these buttons (since they are already sized).
 
@@ skipping 1583 matching lines @@
     case OPTIONS_PAGE_ADVANCED:
       return underTheHoodView_;
     case OPTIONS_PAGE_DEFAULT:
     case OPTIONS_PAGE_COUNT:
       LOG(DFATAL) << "Invalid page value " << page;
   }
   return basicsView_;
 }
 
 @end