Remove the duplicated clear of ViewsDelegate::views_delegate in ~ShellViewsDelegateAura().

content/shell/shell_aura.cc

 // 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.
 
 #include "content/shell/shell.h"
 
 #include "base/command_line.h"
 #include "base/utf_string_conversions.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_contents_view.h"
@@ skipping 23 matching lines @@
 #include "ui/aura/test/test_screen.h"
 #endif
 
 // ViewDelegate implementation for aura content shell
 class ShellViewsDelegateAura : public views::DesktopTestViewsDelegate {
  public:
   ShellViewsDelegateAura() : use_transparent_windows_(false) {
   }
 
   virtual ~ShellViewsDelegateAura() {
-    ViewsDelegate::views_delegate = NULL;
   }
 
   void SetUseTransparentWindows(bool transparent) {
     use_transparent_windows_ = transparent;
   }
 
   // Overridden from views::TestViewsDelegate:
   virtual bool UseTransparentWindows() const OVERRIDE {
     return use_transparent_windows_;
   }
@@ skipping 314 matching lines @@
 }
 
 void Shell::PlatformSetTitle(const string16& title) {
   ShellWindowDelegateView* delegate_view =
     static_cast<ShellWindowDelegateView*>(window_widget_->widget_delegate());
   delegate_view->SetWindowTitle(title);
   window_widget_->UpdateWindowTitle();
 }
 
 }  // namespace content