Make WebUI webview content script work with incognito.

extensions/browser/guest_view/web_view/web_view_content_script_manager.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 "extensions/browser/guest_view/web_view/web_view_content_script_manager.h"
 
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/browser_thread.h"
 #include "extensions/browser/declarative_user_script_manager.h"
 #include "extensions/browser/declarative_user_script_master.h"
@@ skipping 31 matching lines @@
     int embedder_process_id,
     int embedder_routing_id,
     int view_instance_id,
     const HostID& host_id,
     const std::map<std::string, UserScript>& scripts) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 
   DeclarativeUserScriptMaster* master =
       ExtensionSystem::Get(browser_context_)
           ->declarative_user_script_manager()
-          ->GetDeclarativeUserScriptMasterByID(host_id);
+          ->GetDeclarativeUserScriptMasterByID(browser_context_, host_id);
   DCHECK(master);
 
   // We need to update WebViewRenderState in the IO thread if the guest exists.
   std::set<int> ids_to_add;
 
   GuestMapKey key = std::pair<int, int>(embedder_process_id, view_instance_id);
   GuestContentScriptMap::iterator iter = guest_content_script_map_.find(key);
 
   // If there isn't any content script added for the given guest yet, insert an
   // empty map first.
@@ skipping 92 matching lines @@
   if (iter == guest_content_script_map_.end())
     return ids;
   const ContentScriptMap& map = iter->second;
   for (const auto& pair : map)
     ids.insert(pair.second.id());
 
   return ids;
 }
 
 }  // namespace extensions