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

chrome/browser/ui/gtk/tabs/tab_strip_gtk.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 "chrome/browser/ui/gtk/tabs/tab_strip_gtk.h"
 
 #include <gtk/gtk.h>
 
 #include <algorithm>
 #include <string>
@@ skipping 2167 matching lines @@
   GdkEvent* event = gtk_get_current_event();
   DCHECK_EQ(event->type, GDK_BUTTON_RELEASE);
   int mouse_button = event->button.button;
   gdk_event_free(event);
 
   switch (mouse_button) {
     case 1:
       content::RecordAction(UserMetricsAction("NewTab_Button"));
       UMA_HISTOGRAM_ENUMERATION("Tab.NewTab", TabStripModel::NEW_TAB_BUTTON,
                                 TabStripModel::NEW_TAB_ENUM_COUNT);
-      model_->delegate()->AddBlankTabAt(-1, true);
+      model_->delegate()->AddURLTabAt(GURL(), -1, true);
       break;
     case 2: {
       // On middle-click, try to parse the PRIMARY selection as a URL and load
       // it instead of creating a blank page.
       GURL url;
       if (!gtk_util::URLFromPrimarySelection(model_->profile(), &url))
         return;
 
       Browser* browser = window_->browser();
       DCHECK(browser);
@@ skipping 66 matching lines @@
 
 void TabStripGtk::SetNewTabButtonBackground() {
   SkColor color = theme_service_->GetColor(
       ThemeProperties::COLOR_BUTTON_BACKGROUND);
   SkBitmap background = theme_service_->GetImageNamed(
       IDR_THEME_WINDOW_CONTROL_BACKGROUND).AsBitmap();
   SkBitmap mask = theme_service_->GetImageNamed(
       IDR_NEWTAB_BUTTON_MASK).AsBitmap();
   newtab_button_->SetBackground(color, background, mask);
 }