Fixed title updating for back forward navigation.

ios/chrome/browser/ui/history/history_ui_egtest.mm

 // Copyright 2016 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 <EarlGrey/EarlGrey.h>
 #import <UIKit/UIKit.h>
 #import <XCTest/XCTest.h>
 
 #include "base/strings/stringprintf.h"
 #include "base/strings/sys_string_conversions.h"
@@ skipping 255 matching lines @@
       assertWithMatcher:grey_notNil()];
 
   // Tap a history entry and assert that navigation to that entry's URL occurs.
   [[EarlGrey selectElementWithMatcher:HistoryEntry(_URL1, kTitle1)]
       performAction:grey_tap()];
   [[EarlGrey selectElementWithMatcher:WebViewContainingText(kResponse1)]
       assertWithMatcher:grey_notNil()];
 }
 
 // Tests that history is not changed after performing back navigation.
-// TODO(crbug.com/688047): Enable this test.
-- (void)DISABLED_testHistoryUpdateAfterBackNavigation {
+- (void)testHistoryUpdateAfterBackNavigation {
   [ChromeEarlGrey loadURL:_URL1];
   [ChromeEarlGrey loadURL:_URL2];
 
   [[EarlGrey selectElementWithMatcher:chrome_test_util::BackButton()]
       performAction:grey_tap()];
   [[EarlGrey selectElementWithMatcher:WebViewContainingText(kResponse1)]
       assertWithMatcher:grey_notNil()];
 
   [self openHistoryPanel];
 
@@ skipping 250 matching lines @@
 - (void)resetBrowsingDataPrefs {
   PrefService* prefs = chrome_test_util::GetOriginalBrowserState()->GetPrefs();
   prefs->ClearPref(browsing_data::prefs::kDeleteBrowsingHistory);
   prefs->ClearPref(browsing_data::prefs::kDeleteCookies);
   prefs->ClearPref(browsing_data::prefs::kDeleteCache);
   prefs->ClearPref(browsing_data::prefs::kDeletePasswords);
   prefs->ClearPref(browsing_data::prefs::kDeleteFormData);
 }
 
 @end