Change how ui::Clipboard is accessed so there's only one per thread.

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/utf_string_conversions.h"
 #include "ui/aura/desktop/desktop_screen.h"
 #include "ui/aura/desktop/desktop_stacking_client.h"
 #include "ui/aura/display_manager.h"
@@ skipping 34 matching lines @@
 
   virtual ~ShellViewsDelegateAura() {
     ViewsDelegate::views_delegate = NULL;
   }
 
   void SetUseTransparentWindows(bool transparent) {
     use_transparent_windows_ = transparent;
   }
 
   // Overridden from ViewsDelegate:
-  virtual ui::Clipboard* GetClipboard() const OVERRIDE {
-    if (!clipboard_.get()) {
-      clipboard_.reset(new ui::Clipboard);
-    }
-    return clipboard_.get();
-  }
-
   virtual void SaveWindowPlacement(const Widget* window,
                                    const std::string& window_name,
                                    const gfx::Rect& bounds,
                                    ui::WindowShowState show_state) OVERRIDE {
   }
 
   virtual bool GetSavedWindowPlacement(
       const std::string& window_name,
       gfx::Rect* bounds,
       ui::WindowShowState* show_state) const OVERRIDE {
@@ skipping 32 matching lines @@
     return new views::DesktopNativeWidgetHelperAura(native_widget);
   }
 
   virtual content::WebContents* CreateWebContents(
       content::BrowserContext* browser_context,
       content::SiteInstance* site_instance) OVERRIDE {
     return NULL;
   }
 
  private:
-  mutable scoped_ptr<ui::Clipboard> clipboard_;
   bool use_transparent_windows_;
 
   DISALLOW_COPY_AND_ASSIGN(ShellViewsDelegateAura);
 };
 
 // Maintain the UI controls and web view for content shell
 class ShellWindowDelegateView : public WidgetDelegateView,
                                 public TextfieldController,
                                 public ButtonListener {
  public:
@@ skipping 275 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