Using MIME types in addition to plugin name to differentiate between plugins.

chrome/browser/plugins/plugin_finder.h

 // Copyright (c) 2012 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_PLUGINS_PLUGIN_FINDER_H_
 #define CHROME_BROWSER_PLUGINS_PLUGIN_FINDER_H_
 
 #include <map>
 #include <string>
 
@@ skipping 68 matching lines @@
 
   void InitInternal();
 
   scoped_ptr<base::DictionaryValue> plugin_list_;
 #if defined(ENABLE_PLUGIN_INSTALLATION)
   std::map<std::string, PluginInstaller*> installers_;
 #endif
 
   std::map<std::string, PluginMetadata*> identifier_plugin_;
 
-  // Note: Don't free memory for |name_plugin_| values
-  // since it holds pointers to same instances
-  // in |identifier_plugin_| (Double De-allocation).
-  std::map<string16, PluginMetadata*> name_plugin_;
-
   // Synchronization for the above member variables is
   // required since multiple threads can be accessing them concurrently.
   base::Lock mutex_;
 
   DISALLOW_COPY_AND_ASSIGN(PluginFinder);
 };
 
 #endif  // CHROME_BROWSER_PLUGINS_PLUGIN_FINDER_H_