Remove enable_notifications build flag and define

chrome/browser/chrome_content_browser_client.cc

 // 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.
 
 #include "chrome/browser/chrome_content_browser_client.h"
 
 #include <map>
 #include <set>
 #include <utility>
 #include <vector>
@@ skipping 2251 matching lines @@
   chrome::ShowSSLClientCertificateSelector(web_contents, cert_request_info,
                                            std::move(delegate));
 }
 
 content::MediaObserver* ChromeContentBrowserClient::GetMediaObserver() {
   return MediaCaptureDevicesDispatcher::GetInstance();
 }
 
 content::PlatformNotificationService*
 ChromeContentBrowserClient::GetPlatformNotificationService() {
-#if defined(ENABLE_NOTIFICATIONS)
   return PlatformNotificationServiceImpl::GetInstance();
-#else
-  NOTIMPLEMENTED();
-  return NULL;
-#endif
 }
 
 bool ChromeContentBrowserClient::CanCreateWindow(
     const GURL& opener_url,
     const GURL& opener_top_level_frame_url,
     const GURL& source_origin,
     WindowContainerType container_type,
     const GURL& target_url,
     const content::Referrer& referrer,
     const std::string& frame_name,
@@ skipping 1027 matching lines @@
       render_frame_host, std::move(source), std::move(request));
 #else
   // Chrome's media remoting implementation depends on the Media Router
   // infrastructure to identify remote sinks and provide the user interface for
   // sink selection. In the case where the Media Router is not present, simply
   // drop the interface request. This will prevent code paths for media remoting
   // in the renderer process from activating.
 #endif
 }
 #endif  // BUILDFLAG(ENABLE_MEDIA_REMOTING)