Refactoring: de-couple Extensions from "script injection System" [render side]:4

extensions/renderer/script_injection_manager.h

 // Copyright 2014 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.
 
 #ifndef EXTENSIONS_RENDERER_SCRIPT_INJECTION_MANAGER_H_
 #define EXTENSIONS_RENDERER_SCRIPT_INJECTION_MANAGER_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 42 matching lines @@
 
  private:
   // A RenderViewObserver implementation which watches the various render views
   // in order to notify the ScriptInjectionManager of different document load
   // states.
   class RVOHelper;
 
   typedef std::map<blink::WebFrame*, UserScript::RunLocation> FrameStatusMap;
 
   // UserScriptSetManager::Observer implementation.
-  void OnUserScriptsUpdated(const std::set<std::string>& changed_extensions,
+  void OnUserScriptsUpdated(const std::set<HostID>& changed_hosts,
                             const std::vector<UserScript*>& scripts) override;
 
   // Notifies that an RVOHelper should be removed.
   void RemoveObserver(RVOHelper* helper);
 
   // Invalidate any pending tasks associated with |frame|.
   void InvalidateForFrame(blink::WebFrame* frame);
 
   // Starts the process to inject appropriate scripts into |frame|.
   void StartInjectScripts(blink::WebFrame* frame,
@@ skipping 44 matching lines @@
 
   ScopedObserver<UserScriptSetManager, UserScriptSetManager::Observer>
       user_script_set_manager_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(ScriptInjectionManager);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_RENDERER_SCRIPT_INJECTION_MANAGER_H_