[NTP Snippets] Move kOfflinePageSuggestionsFeature into the component

chrome/browser/ntp_snippets/content_suggestions_service_factory.cc

 // Copyright 2016 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/ntp_snippets/content_suggestions_service_factory.h"
 
 #include "base/feature_list.h"
 #include "base/files/file_path.h"
 #include "base/memory/ptr_util.h"
 #include "base/memory/singleton.h"
@@ skipping 94 matching lines @@
       base::FeatureList::IsEnabled(ntp_snippets::kContentSuggestionsFeature)
           ? State::ENABLED
           : State::DISABLED;
   ContentSuggestionsService* service = new ContentSuggestionsService(state);
   if (state == State::DISABLED)
     return service;
 
 #if defined(OS_ANDROID)
   // Create the OfflinePageSuggestionsProvider.
   if (base::FeatureList::IsEnabled(
-          chrome::android::kNTPOfflinePageSuggestionsFeature)) {
+      ntp_snippets::kOfflinePageSuggestionsFeature)) {
     OfflinePageModel* offline_page_model =
         OfflinePageModelFactory::GetForBrowserContext(profile);
 
     std::unique_ptr<OfflinePageSuggestionsProvider>
         offline_page_suggestions_provider =
             base::MakeUnique<OfflinePageSuggestionsProvider>(
                 service, service->category_factory(), offline_page_model);
     service->RegisterProvider(std::move(offline_page_suggestions_provider));
   }
 #endif  // OS_ANDROID
@@ skipping 48 matching lines @@
             base::MakeUnique<ImageDecoderImpl>(),
             base::MakeUnique<NTPSnippetsDatabase>(database_dir, task_runner),
             base::MakeUnique<NTPSnippetsStatusService>(signin_manager,
                                                        profile->GetPrefs()));
     service->set_ntp_snippets_service(ntp_snippets_service.get());
     service->RegisterProvider(std::move(ntp_snippets_service));
   }
 
   return service;
 }