Extract DeclarativeUserScriptManager from ExtensionSystem.

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 "base/lazy_instance.h"
 #include "base/memory/linked_ptr.h"
 #include "components/guest_view/browser/guest_view_manager.h"
 #include "content/public/browser/browser_context.h"
@@ skipping 99 matching lines @@
 void WebViewContentScriptManager::AddContentScripts(
     content::WebContents* embedder_web_contents,
     int embedder_routing_id,
     int view_instance_id,
     const HostID& host_id,
     const std::set<UserScript>& scripts) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   DCHECK(embedder_web_contents);
 
   DeclarativeUserScriptMaster* master =
-      ExtensionSystem::Get(browser_context_)
-          ->declarative_user_script_manager()
+      DeclarativeUserScriptManager::Get(browser_context_)
           ->GetDeclarativeUserScriptMasterByID(host_id);
   DCHECK(master);
 
   // We need to update WebViewRenderState in the IO thread if the guest exists.
   std::set<int> ids_to_add;
 
   int embedder_process_id =
       embedder_web_contents->GetRenderProcessHost()->GetID();
   GuestMapKey key = std::pair<int, int>(embedder_process_id, view_instance_id);
   GuestContentScriptMap::iterator iter = guest_content_script_map_.find(key);
@@ skipping 71 matching lines @@
 
   int embedder_process_id =
       embedder_web_contents->GetRenderProcessHost()->GetID();
   GuestMapKey key = std::pair<int, int>(embedder_process_id, view_instance_id);
   GuestContentScriptMap::iterator script_map_iter =
       guest_content_script_map_.find(key);
   if (script_map_iter == guest_content_script_map_.end())
     return;
 
   DeclarativeUserScriptMaster* master =
-      ExtensionSystem::Get(browser_context_)
-          ->declarative_user_script_manager()
+      DeclarativeUserScriptManager::Get(browser_context_)
           ->GetDeclarativeUserScriptMasterByID(host_id);
   CHECK(master);
 
   // We need to update WebViewRenderState in the IO thread if the guest exists.
   std::set<int> ids_to_delete;
   std::set<UserScript> scripts_to_delete;
 
   // Step 1: removes content scripts from |master| and updates
   // |guest_content_script_map_|.
   std::map<std::string, UserScript>& map = script_map_iter->second;
@@ skipping 83 matching lines @@
 
 void WebViewContentScriptManager::RunCallbacksIfReady() {
   if (user_script_loader_observer_.IsObservingSources())
     return;
   for (auto& callback : pending_scripts_loading_callbacks_)
     callback.Run();
   pending_scripts_loading_callbacks_.clear();
 }
 
 }  // namespace extensions