linux-aura: Restore middle-click on new-tab button behaviour.

chrome/browser/ui/browser_tab_strip_model_delegate.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_BROWSER_TAB_STRIP_MODEL_DELEGATE_H_
 #define CHROME_BROWSER_UI_BROWSER_TAB_STRIP_MODEL_DELEGATE_H_
 
 #include "base/compiler_specific.h"
 #include "base/memory/weak_ptr.h"
 #include "chrome/browser/ui/tabs/tab_strip_model_delegate.h"
 
+class GURL;
+
 namespace chrome {
 
 class BrowserTabStripModelDelegate : public TabStripModelDelegate {
  public:
   explicit BrowserTabStripModelDelegate(Browser* browser);
   virtual ~BrowserTabStripModelDelegate();
 
  private:
   // Overridden from TabStripModelDelegate:
   virtual void AddBlankTabAt(int index, bool foreground) OVERRIDE;
+  virtual void AddURLTabAt(const GURL& u, int index, bool foreground) OVERRIDE;
   virtual Browser* CreateNewStripWithContents(
       const std::vector<NewStripContents>& contentses,
       const gfx::Rect& window_bounds,
       const DockInfo& dock_info,
       bool maximize) OVERRIDE;
   virtual void WillAddWebContents(content::WebContents* contents) OVERRIDE;
   virtual int GetDragActions() const OVERRIDE;
   virtual bool CanDuplicateContentsAt(int index) OVERRIDE;
   virtual void DuplicateContentsAt(int index) OVERRIDE;
   virtual void CloseFrameAfterDragSession() OVERRIDE;
@@ skipping 11 matching lines @@
 
   // The following factory is used to close the frame at a later time.
   base::WeakPtrFactory<BrowserTabStripModelDelegate> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserTabStripModelDelegate);
 };
 
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_UI_BROWSER_TAB_STRIP_MODEL_DELEGATE_H_