revert 128949 (and dependent 129252)

chrome/browser/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_PLUGIN_FINDER_H_
 #define CHROME_BROWSER_PLUGIN_FINDER_H_
 #pragma once
 
 #include <map>
 #include <string>
 
 #include "base/callback.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/singleton.h"
 #include "base/string16.h"
 
 namespace base {
 class DictionaryValue;
+class ListValue;
 }
 
 class GURL;
 class PluginInstaller;
 
 class PluginFinder {
  public:
-  static void Get(const base::Callback<void(PluginFinder*)>& cb);
+  typedef base::Callback<void(PluginInstaller*)> FindPluginCallback;
+
+  static PluginFinder* GetInstance();
 
   // Loads the plug-in information from the browser resources and parses it.
   // Returns NULL if the plug-in list couldn't be parsed.
-  static scoped_ptr<base::DictionaryValue> LoadPluginList();
+  static scoped_ptr<base::ListValue> LoadPluginList();
 
   // Finds a plug-in for the given MIME type and language (specified as an IETF
-  // language tag, i.e. en-US) and returns the PluginInstaller for the plug-in,
-  // or NULL if no plug-in is found.
-  PluginInstaller* FindPlugin(const std::string& mime_type,
-                              const std::string& language);
+  // language tag, i.e. en-US) and calls the callback with the PluginInstaller
+  // for the plug-in, or NULL if no plug-in is found.
+  void FindPlugin(const std::string& mime_type,
+                  const std::string& language,
+                  const FindPluginCallback& callback);
 
-  // Returns the plug-in with the given identifier.
-  PluginInstaller* FindPluginWithIdentifier(const std::string& identifier);
+  // Finds the plug-in with the given identifier and calls the callback.
+  void FindPluginWithIdentifier(const std::string& identifier,
+                                const FindPluginCallback& callback);
 
  private:
   friend struct DefaultSingletonTraits<PluginFinder>;
-  friend class Singleton<PluginFinder>;
-
-  static PluginFinder* GetInstance();
 
   PluginFinder();
   ~PluginFinder();
 
-  static base::DictionaryValue* LoadPluginListInternal();
+  static base::ListValue* LoadPluginListInternal();
 
   PluginInstaller* CreateInstaller(const std::string& identifier,
                                    const base::DictionaryValue* plugin_dict);
+  PluginInstaller* FindPluginInternal(const std::string& mime_type,
+                                      const std::string& language);
 
-  scoped_ptr<base::DictionaryValue> plugin_list_;
+  scoped_ptr<base::ListValue> plugin_list_;
   std::map<std::string, PluginInstaller*> installers_;
 
   DISALLOW_COPY_AND_ASSIGN(PluginFinder);
 };
 
 #endif  // CHROME_BROWSER_PLUGIN_FINDER_H_