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

chrome/browser/plugin_data_remover_browsertest.cc

 // 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.
 
 #include "chrome/browser/plugin_data_remover.h"
 
 #include "base/command_line.h"
 #include "base/path_service.h"
 #include "base/synchronization/waitable_event_watcher.h"
 #include "chrome/browser/ui/browser.h"
@@ skipping 38 matching lines @@
     command_line->AppendSwitchPath(switches::kExtraPluginDir,
                                    browser_directory.AppendASCII("plugins"));
 #endif
   }
 
  private:
   std::string old_plugin_data_remover_mime_type_;
 };
 
 IN_PROC_BROWSER_TEST_F(PluginDataRemoverTest, RemoveData) {
-  scoped_refptr<PluginDataRemover> plugin_data_remover(new PluginDataRemover());
+  scoped_refptr<PluginDataRemover> plugin_data_remover(
+      new PluginDataRemover(browser()->profile()));
   plugin_data_remover->set_mime_type(kNPAPITestPluginMimeType);
   base::WaitableEventWatcher watcher;
   base::WaitableEvent* event =
       plugin_data_remover->StartRemoving(base::Time());
   watcher.StartWatching(event, this);
   ui_test_utils::RunMessageLoop();
 }
 
 IN_PROC_BROWSER_TEST_F(PluginDataRemoverTest, AtShutdown) {
   browser()->profile()->GetPrefs()->SetBoolean(
       prefs::kClearSiteDataOnExit, true);
   g_browser_process->local_state()->SetBoolean(
       prefs::kClearPluginLSODataEnabled, true);
 }