[Refactor] Remove AppBannerManager::app_title_

chrome/browser/banners/app_banner_manager.h

 // Copyright 2015 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.
 
 #ifndef CHROME_BROWSER_BANNERS_APP_BANNER_MANAGER_H_
 #define CHROME_BROWSER_BANNERS_APP_BANNER_MANAGER_H_
 
 #include <vector>
 
 #include "base/macros.h"
@@ skipping 223 matching lines @@
     return false;
   }
   bool is_complete() const { return state_ == State::COMPLETE; }
   bool is_pending_engagement() const {
     return state_ == State::PENDING_ENGAGEMENT;
   }
   bool is_pending_event() const {
     return state_ == State::PENDING_EVENT || page_requested_prompt_;
   }
 
-  // The title to display in the banner.
-  base::string16 app_title_;
-
   // The URL for which the banner check is being conducted.
   GURL validated_url_;
 
   // The URL of the manifest.
   GURL manifest_url_;
 
   // The manifest object.
   content::Manifest manifest_;
 
   // The URL of the primary icon.
@@ skipping 66 matching lines @@
   // scoped to the WebContents which they are observing. This allows us to use
   // weak pointers for callbacks.
   base::WeakPtrFactory<AppBannerManager> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AppBannerManager);
 };
 
 }  // namespace banners
 
 #endif  // CHROME_BROWSER_BANNERS_APP_BANNER_MANAGER_H_