Use PluginPrefs in ChromePluginServiceFilter to check whether a plugin is enabled.

chrome/browser/plugin_data_remover.h

 // Copyright (c) 2011 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 CHROME_BROWSER_PLUGIN_DATA_REMOVER_H_
 #define CHROME_BROWSER_PLUGIN_DATA_REMOVER_H_
 #pragma once
 
 #include "base/memory/ref_counted.h"
 #include "base/time.h"
 #include "content/browser/plugin_process_host.h"
 
+class Profile;
 class Task;
 
 namespace base {
 class MessageLoopProxy;
 class WaitableEvent;
 }
 
 class PluginDataRemover : public base::RefCountedThreadSafe<PluginDataRemover>,
                           public PluginProcessHost::Client,
                           public IPC::Channel::Listener {
  public:
-  PluginDataRemover();
+  explicit PluginDataRemover(Profile* profile);
 
   // The plug-in whose data should be removed (usually Flash) is specified via
   // its MIME type. This method sets a different MIME type in order to call a
   // different plug-in (for example in tests).
   void set_mime_type(const std::string& mime_type) { mime_type_ = mime_type; }
 
   // Starts removing plug-in data stored since |begin_time|.
   base::WaitableEvent* StartRemoving(base::Time begin_time);
 
   // Returns whether there is a plug-in installed that supports removing
   // LSO data. Because this method possibly has to load the plug-in list, it
   // should only be called on the FILE thread.
   static bool IsSupported();
 
   // Indicates whether we are still in the process of removing plug-in data.
   bool is_removing() const { return is_removing_; }
 
   // Wait until removing has finished. When the browser is still running (i.e.
   // not during shutdown), you should use a WaitableEventWatcher in combination
   // with the WaitableEvent returned by StartRemoving.
   void Wait();
 
   // PluginProcessHost::Client methods.
   virtual int ID();
   virtual bool OffTheRecord();
+  virtual const content::ResourceContext& GetResourceContext();
   virtual void SetPluginInfo(const webkit::npapi::WebPluginInfo& info);
   virtual void OnChannelOpened(const IPC::ChannelHandle& handle);
   virtual void OnError();
 
   // IPC::Channel::Listener methods.
   virtual bool OnMessageReceived(const IPC::Message& message);
   virtual void OnChannelError();
 
  private:
   friend class base::RefCountedThreadSafe<PluginDataRemover>;
@@ skipping 10 matching lines @@
   // Called when a timeout happens in order not to block the client
   // indefinitely.
   void OnTimeout();
 
   std::string mime_type_;
   bool is_removing_;
   // The point in time when we start removing data.
   base::Time remove_start_time_;
   // The point in time from which on we remove data.
   base::Time begin_time_;
+  // The resource context for the profile.
+  const content::ResourceContext& context_;
   scoped_ptr<base::WaitableEvent> event_;
   // We own the channel, but it's used on the IO thread, so it needs to be
   // deleted there. It's NULL until we have opened a connection to the plug-in
   // process.
   IPC::Channel* channel_;
 
   DISALLOW_COPY_AND_ASSIGN(PluginDataRemover);
 };
 
 #endif  // CHROME_BROWSER_PLUGIN_DATA_REMOVER_H_