Adding the code inside extension flag to avoid build breaks.

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 <set>
 #include <utility>
 #include <vector>
 
@@ skipping 1785 matching lines @@
 void ChromeContentBrowserClient::RequestDesktopNotificationPermission(
     const GURL& source_origin,
     content::RenderFrameHost* render_frame_host,
     const base::Callback<void(blink::WebNotificationPermission)>& callback) {
 #if defined(ENABLE_NOTIFICATIONS)
   // Skip showing the infobar if the request comes from an extension, and that
   // extension has the 'notify' permission. (If the extension does not have the
   // permission, the user will still be prompted.)
   Profile* profile = Profile::FromBrowserContext(
       render_frame_host->GetSiteInstance()->GetBrowserContext());
+  DesktopNotificationService* notification_service =
+      DesktopNotificationServiceFactory::GetForProfile(profile);
+#if defined(ENABLE_EXTENSIONS)
   InfoMap* extension_info_map =
       extensions::ExtensionSystem::Get(profile)->info_map();
-  DesktopNotificationService* notification_service =
-      DesktopNotificationServiceFactory::GetForProfile(profile);
   const Extension* extension = NULL;
   if (extension_info_map) {
     extensions::ExtensionSet extensions;
     extension_info_map->GetExtensionsWithAPIPermissionForSecurityOrigin(
         source_origin,
         render_frame_host->GetProcess()->GetID(),
         extensions::APIPermission::kNotifications,
         &extensions);
     for (extensions::ExtensionSet::const_iterator iter = extensions.begin();
          iter != extensions.end(); ++iter) {
       if (notification_service->IsNotifierEnabled(NotifierId(
               NotifierId::APPLICATION, (*iter)->id()))) {
         extension = iter->get();
         break;
       }
     }
   }
   if (IsExtensionWithPermissionOrSuggestInConsole(
           APIPermission::kNotifications,
           extension,
           render_frame_host->GetRenderViewHost())) {
     callback.Run(blink::WebNotificationPermissionAllowed);
     return;
   }
+#endif
 
   WebContents* web_contents = WebContents::FromRenderFrameHost(
       render_frame_host);
   int render_process_id = render_frame_host->GetProcess()->GetID();
   const PermissionRequestID request_id(render_process_id,
       web_contents->GetRoutingID(),
       -1 /* bridge id */,
       GURL());
 
   notification_service->RequestNotificationPermission(
@@ skipping 770 matching lines @@
       switches::kDisableWebRtcEncryption,
     };
     to_command_line->CopySwitchesFrom(from_command_line,
                                       kWebRtcDevSwitchNames,
                                       arraysize(kWebRtcDevSwitchNames));
   }
 }
 #endif  // defined(ENABLE_WEBRTC)
 
 }  // namespace chrome