Create thread-safe RendererExtensionRegistry from ExtensionSet

extensions/renderer/user_script_set.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_USER_SCRIPT_SET_H_
 #define EXTENSIONS_RENDERER_USER_SCRIPT_SET_H_
 
 #include <set>
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/scoped_vector.h"
 #include "base/memory/shared_memory.h"
 #include "base/observer_list.h"
 #include "content/public/renderer/render_process_observer.h"
 #include "extensions/common/user_script.h"
 
 class GURL;
 
 namespace content {
 class RenderFrame;
 }
 
 namespace extensions {
-class ExtensionSet;
 class ScriptInjection;
 
 // The UserScriptSet is a collection of UserScripts which knows how to update
 // itself from SharedMemory and create ScriptInjections for UserScripts to
 // inject on a page.
 class UserScriptSet {
  public:
   class Observer {
    public:
     virtual void OnUserScriptsUpdated(
         const std::set<HostID>& changed_hosts,
         const std::vector<UserScript*>& scripts) = 0;
   };
 
-  explicit UserScriptSet(const ExtensionSet* extensions);
+  UserScriptSet();
   ~UserScriptSet();
 
   // Adds or removes observers.
   void AddObserver(Observer* observer);
   void RemoveObserver(Observer* observer);
 
   // Appends the ids of the extensions that have user scripts to |ids|.
   void GetActiveExtensionIds(std::set<std::string>* ids) const;
 
   // Append any ScriptInjections that should run on the given |render_frame| and
@@ skipping 27 matching lines @@
       const UserScript* script,
       content::RenderFrame* render_frame,
       int tab_id,
       UserScript::RunLocation run_location,
       const GURL& document_url,
       bool is_declarative);
 
   // Shared memory containing raw script data.
   scoped_ptr<base::SharedMemory> shared_memory_;
 
-  // The set of all known extensions. Owned by the Dispatcher.
-  const ExtensionSet* extensions_;
-
   // The UserScripts this injector manages.
   ScopedVector<UserScript> scripts_;
 
   // The associated observers.
   base::ObserverList<Observer> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(UserScriptSet);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_RENDERER_USER_SCRIPT_SET_H_