Refactor some more BrowserMain code. Move core code that's required by all embedders to content.

chrome/browser/browser_main_gtk.h

 // 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.
 
 // Contains functions used by BrowserMain() that are gtk-specific.
 
 #ifndef CHROME_BROWSER_BROWSER_MAIN_GTK_H_
 #define CHROME_BROWSER_BROWSER_MAIN_GTK_H_
 #pragma once
 
 #include "base/compiler_specific.h"
 #include "chrome/browser/browser_main_posix.h"
 
 class BrowserMainPartsGtk : public BrowserMainPartsPosix {
  public:
   explicit BrowserMainPartsGtk(const MainFunctionParams& parameters);
 
   virtual void PreEarlyInitialization() OVERRIDE;
 
  private:
   void DetectRunningAsRoot();
-  void SetupSandbox();
 };
 
 // Installs the X11 error handlers for the browser process. This will
 // allow us to exit cleanly if X exits before us.
 void SetBrowserX11ErrorHandlers();
 
 #endif  // CHROME_BROWSER_BROWSER_MAIN_GTK_H_