[MD History] Fix toolbar dates in grouped mode.

chrome/browser/ui/webui/history_ui.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/webui/history_ui.h"
 
 #include <string>
 #include <utility>
 
 #include "base/command_line.h"
@@ skipping 86 matching lines @@
   source->AddLocalizedString("searchResultsFor", IDS_HISTORY_SEARCHRESULTSFOR);
   source->AddLocalizedString("searchResult", IDS_HISTORY_SEARCH_RESULT);
   source->AddLocalizedString("searchResults", IDS_HISTORY_SEARCH_RESULTS);
   source->AddLocalizedString("foundSearchResults",
                              IDS_HISTORY_FOUND_SEARCH_RESULTS);
   source->AddLocalizedString("history", IDS_HISTORY_BROWSERESULTS);
   source->AddLocalizedString("cont", IDS_HISTORY_CONTINUED);
   source->AddLocalizedString("searchButton", IDS_HISTORY_SEARCH_BUTTON);
   source->AddLocalizedString("noSearchResults", IDS_HISTORY_NO_SEARCH_RESULTS);
   source->AddLocalizedString("noResults", IDS_HISTORY_NO_RESULTS);
-  source->AddLocalizedString("historyInterval", IDS_HISTORY_INTERVAL);
   source->AddLocalizedString("removeSelected",
                              IDS_HISTORY_REMOVE_SELECTED_ITEMS);
   source->AddLocalizedString("clearAllHistory",
                              IDS_HISTORY_OPEN_CLEAR_BROWSING_DATA_DIALOG);
 
   auto availability = IncognitoModePrefs::GetAvailability(profile->GetPrefs());
   base::string16 delete_string = availability == IncognitoModePrefs::ENABLED
              ? l10n_util::GetStringFUTF16(
                    IDS_HISTORY_DELETE_PRIOR_VISITS_WARNING,
                    base::UTF8ToUTF16(kIncognitoModeShortcut))
@@ skipping 100 matching lines @@
 }
 
 void HistoryUI::UpdateDataSource() {
   CHECK(web_ui());
   Profile* profile = Profile::FromWebUI(web_ui());
   std::unique_ptr<base::DictionaryValue> update(new base::DictionaryValue);
   update->SetBoolean(kIsUserSignedInKey, IsSignedIn(profile));
   content::WebUIDataSource::Update(profile, chrome::kChromeUIHistoryFrameHost,
                                    std::move(update));
 }