Fixed title updating for back forward navigation.

ios/chrome/browser/tabs/tab_unittest.mm

 // Copyright 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.
 
 #import <UIKit/UIKit.h>
 
 #include <memory>
 
 #include "base/callback.h"
 #include "base/files/file_path.h"
@@ skipping 228 matching lines @@
                     transition:ui::PAGE_TRANSITION_CLIENT_REDIRECT];
     [[tab_ navigationManager]->GetSessionController()
            addPendingItem:redirectUrl
                  referrer:empty_referrer
                transition:ui::PAGE_TRANSITION_CLIENT_REDIRECT
         rendererInitiated:YES];
     web_state_impl_->OnProvisionalNavigationStarted(redirectUrl);
     [[tab_ navigationManager]->GetSessionController() commitPendingItem];
     [[tab_ webController] webStateImpl]->OnNavigationCommitted(redirectUrl);
     [tab_ webDidStartLoadingURL:redirectUrl shouldUpdateHistory:YES];
+    base::string16 new_title = base::SysNSStringToUTF16(title);
+    [tab_ navigationManager]->GetLastCommittedItem()->SetTitle(new_title);
     [tab_ webController:mock_web_controller_ titleDidChange:title];
     [[[(id)mock_web_controller_ expect]
         andReturnValue:OCMOCK_VALUE(kPageLoaded)] loadPhase];
     web_state_impl_->OnPageLoaded(redirectUrl, true);
   }
 
   void BrowseToNewTab() {
     DCHECK_EQ(tab_.get().webState, web_state_impl_);
     const GURL url(kNewTabUrl);
     // TODO(crbug.com/661992): This will not work with a mock CRWWebController.
@@ skipping 292 matching lines @@
       [[FakeNativeAppMetadata alloc] init]);
 
   // Turn auto open on.
   [metadata setShouldAutoOpenLinks:YES];
   int expectedCallCount = 2;
   TestOpenNativeAppURL(testURL, NO, expectedCallCount, NO);
   EXPECT_FALSE([metadata shouldAutoOpenLinks]);
 }
 
 }  // namespace