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

chrome/browser/ui/browser_tab_strip_model_delegate.h

Index: chrome/browser/ui/browser_tab_strip_model_delegate.h
diff --git a/chrome/browser/ui/browser_tab_strip_model_delegate.h b/chrome/browser/ui/browser_tab_strip_model_delegate.h
index 405c01f5ef7b90849e348348bea2ce05abb2228b..8761b9ee439fc7bc7b13b5311755be8b2783f140 100644
--- a/chrome/browser/ui/browser_tab_strip_model_delegate.h
+++ b/chrome/browser/ui/browser_tab_strip_model_delegate.h
@@ -9,6 +9,8 @@
 #include "base/memory/weak_ptr.h"
 #include "chrome/browser/ui/tabs/tab_strip_model_delegate.h"
 
+class GURL;
+
 namespace chrome {
 
 class BrowserTabStripModelDelegate : public TabStripModelDelegate {
@@ -19,6 +21,7 @@ class BrowserTabStripModelDelegate : public TabStripModelDelegate {
  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,