Add possibility to define data callback to BitmapFetcher

chrome/browser/extensions/bookmark_app_helper.cc

 // Copyright 2014 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/extensions/bookmark_app_helper.h"
 
 #include <cctype>
 
 #include "base/prefs/pref_service.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 235 matching lines @@
     FinishInstallation();
     Release();
   }
 
   void DownloadNextImage() {
     DCHECK(urls_to_download_.size());
 
     bitmap_fetcher_.reset(
         new chrome::BitmapFetcher(urls_to_download_.back(), this));
     urls_to_download_.pop_back();
-    bitmap_fetcher_->Start(
+    bitmap_fetcher_->Init(
         service_->profile()->GetRequestContext(), std::string(),
         net::URLRequest::CLEAR_REFERRER_ON_TRANSITION_FROM_SECURE_TO_INSECURE,
         net::LOAD_DO_NOT_SAVE_COOKIES | net::LOAD_DO_NOT_SEND_COOKIES);
+    bitmap_fetcher_->Start();
   }
 
   void FinishInstallation() {
     std::map<int, BookmarkAppHelper::BitmapAndSource> size_map =
         BookmarkAppHelper::ResizeIconsAndGenerateMissing(downloaded_bitmaps_,
                                                          &web_app_info_);
     BookmarkAppHelper::UpdateWebAppIconsWithoutChangingLinks(size_map,
                                                              &web_app_info_);
     scoped_refptr<extensions::CrxInstaller> installer(
         extensions::CrxInstaller::CreateSilent(service_));
@@ skipping 443 matching lines @@
       extension, info_list, base::Bind(&OnIconsLoaded, web_app_info, callback));
 }
 
 bool IsValidBookmarkAppUrl(const GURL& url) {
   URLPattern origin_only_pattern(Extension::kValidWebExtentSchemes);
   origin_only_pattern.SetMatchAllURLs(true);
   return url.is_valid() && origin_only_pattern.MatchesURL(url);
 }
 
 }  // namespace extensions