Remove bad use of CancelableCallback from BrowingDataAppCacheHelper

chrome/browser/browsing_data/browsing_data_appcache_helper.h

 // 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.
 
 #ifndef CHROME_BROWSER_BROWSING_DATA_BROWSING_DATA_APPCACHE_HELPER_H_
 #define CHROME_BROWSER_BROWSING_DATA_BROWSING_DATA_APPCACHE_HELPER_H_
 
 #include <map>
 
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "content/public/browser/appcache_service.h"
-#include "net/base/completion_callback.h"
 #include "url/gurl.h"
 
 namespace content {
 class BrowserContext;
 }
 
 // This class fetches appcache information on behalf of a caller
 // on the UI thread.
 class BrowsingDataAppCacheHelper
     : public base::RefCountedThreadSafe<BrowsingDataAppCacheHelper> {
@@ skipping 15 matching lines @@
   virtual ~BrowsingDataAppCacheHelper();
 
   base::Closure completion_callback_;
   scoped_refptr<content::AppCacheInfoCollection> info_collection_;
 
  private:
   void OnFetchComplete(int rv);
 
   bool is_fetching_;
   content::AppCacheService* appcache_service_;
-  net::CancelableCompletionCallback appcache_info_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowsingDataAppCacheHelper);
 };
 
 // This class is a thin wrapper around BrowsingDataAppCacheHelper that does not
 // fetch its information from the appcache service, but gets them passed as
 // a parameter during construction.
 class CannedBrowsingDataAppCacheHelper : public BrowsingDataAppCacheHelper {
  public:
   explicit CannedBrowsingDataAppCacheHelper(
@@ skipping 19 matching lines @@
   void StartFetching(const base::Closure& completion_callback) override;
   void DeleteAppCacheGroup(const GURL& manifest_url) override;
 
  private:
   ~CannedBrowsingDataAppCacheHelper() override;
 
   DISALLOW_COPY_AND_ASSIGN(CannedBrowsingDataAppCacheHelper);
 };
 
 #endif  // CHROME_BROWSER_BROWSING_DATA_BROWSING_DATA_APPCACHE_HELPER_H_