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

chrome/browser/ui/cocoa/tabs/tab_strip_controller.mm

 // 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.
 
 #import "chrome/browser/ui/cocoa/tabs/tab_strip_controller.h"
 
 #import <QuartzCore/QuartzCore.h>
 
 #include <limits>
 #include <string>
@@ skipping 1197 matching lines @@
 
 // Called when a notification is received from the model to select a particular
 // tab. Swaps in the toolbar and content area associated with |newContents|.
 - (void)activateTabWithContents:(TabContentsWrapper*)newContents
                previousContents:(TabContentsWrapper*)oldContents
                         atIndex:(NSInteger)modelIndex
                     userGesture:(bool)wasUserGesture {
   // Take closing tabs into account.
   NSInteger activeIndex = [self indexFromModelIndex:modelIndex];
 
-  if (oldContents && oldContents != newContents) {
+  if (oldContents) {
     int oldModelIndex =
         browser_->GetIndexOfController(&(oldContents->controller()));
     if (oldModelIndex != -1) {  // When closing a tab, the old tab may be gone.
       NSInteger oldIndex = [self indexFromModelIndex:oldModelIndex];
       TabContentsController* oldController =
           [tabContentsArray_ objectAtIndex:oldIndex];
       [oldController willBecomeUnselectedTab];
       oldContents->view()->StoreFocus();
       oldContents->tab_contents()->WasHidden();
     }
@@ skipping 907 matching lines @@
   }
 
   std::string profileName = browser_->profile()->GetPrefs()->GetString(
       prefs::kGoogleServicesUsername);
   [profileMenuButton_ setProfileDisplayName:
       [NSString stringWithUTF8String:profileName.c_str()]];
   [profileMenuButton_ setHidden:NO];
 }
 
 @end