[OfflinePages] RequestCoordinatorFactory return null for incognito

chrome/browser/android/offline_pages/offline_page_utils.cc

 // 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.
 
 #include "chrome/browser/android/offline_pages/offline_page_utils.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_piece.h"
@@ skipping 167 matching lines @@
 }
 
 // static
 void OfflinePageUtils::CheckExistenceOfRequestsWithURL(
     content::BrowserContext* browser_context,
     const std::string name_space,
     const GURL& offline_page_url,
     const PagesExistCallback& callback) {
   RequestCoordinator* request_coordinator =
       RequestCoordinatorFactory::GetForBrowserContext(browser_context);
+  if (!request_coordinator)
+    return;
 
   auto request_coordinator_continuation = [](
       const std::string& name_space, const GURL& offline_page_url,
       const PagesExistCallback& callback,
       std::vector<std::unique_ptr<SavePageRequest>> requests) {
     base::Time latest_request_time;
     for (auto& request : requests) {
       if (request->url() == offline_page_url &&
           request->client_id().name_space == name_space &&
           latest_request_time < request->creation_time()) {
@@ skipping 14 matching lines @@
   GURL::Replacements remove_params;
   remove_params.ClearRef();
 
   GURL lhs_stripped = lhs.ReplaceComponents(remove_params);
   GURL rhs_stripped = rhs.ReplaceComponents(remove_params);
 
   return lhs_stripped == rhs_stripped;
 }
 
 }  // namespace offline_pages