Multi-tab: Adding new Notification when tab selection changes.

chrome/browser/ui/gtk/browser_window_gtk.cc

 // Copyright (c) 2011 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/browser_window_gtk.h"
 
 #include <gdk/gdkkeysyms.h>
 
 #include <dlfcn.h>
 #include <string>
@@ skipping 1157 matching lines @@
     infobar_container_->ChangeTabContents(NULL);
     UpdateDevToolsForContents(NULL);
   }
   contents_container_->DetachTab(contents);
 }
 
 void BrowserWindowGtk::ActiveTabChanged(TabContentsWrapper* old_contents,
                                         TabContentsWrapper* new_contents,
                                         int index,
                                         bool user_gesture) {
-  if (old_contents == new_contents)
-    return;
-
   if (old_contents && !old_contents->tab_contents()->is_being_destroyed())
     old_contents->view()->StoreFocus();
 
   // Update various elements that are interested in knowing the current
   // TabContents.
   infobar_container_->ChangeTabContents(new_contents);
   contents_container_->SetTab(new_contents);
   UpdateDevToolsForContents(new_contents->tab_contents());
 
   new_contents->tab_contents()->DidBecomeSelected();
@@ skipping 1185 matching lines @@
   // are taken from the WMs' source code.
   return (wm_name == "Blackbox" ||
           wm_name == "compiz" ||
           wm_name == "Compiz" ||
           wm_name == "e16" ||  // Enlightenment DR16
           wm_name == "Metacity" ||
           wm_name == "Mutter" ||
           wm_name == "Openbox" ||
           wm_name == "Xfwm4");
 }