Add PluginInstaller to encapsulate information about a missing plug-in.

chrome/browser/plugin_finder.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_FINDER_H_
 #define CHROME_BROWSER_PLUGIN_FINDER_H_
 #pragma once
 
+#include <map>
 #include <string>
-#include <vector>
 
 #include "base/callback.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/singleton.h"
 #include "base/string16.h"
 
 namespace base {
 class ListValue;
 }
 
 class GURL;
+class PluginInstaller;
 
 class PluginFinder {
  public:
-  // If |display_url| is false, |plugin_url| is the URL of the download page for
-  // the plug-in, which should be opened in a new tab. If it is true,
-  // |plugin_url| is the URL of the plug-in installer binary, which can be
-  // directly downloaded.
-  typedef base::Callback<void(GURL /* plugin_url */,
-                              string16 /* name */,
-                              bool /* display_url */)> FindPluginCallback;
+  typedef base::Callback<void(PluginInstaller*)> FindPluginCallback;
 
   static PluginFinder* GetInstance();
 
   // Finds a plug-in for the given MIME type and language (specified as an IETF
   // language tag, i.e. en-US) and calls one of the two passed in callbacks,
   // depending on whether a plug-in is found.
   void FindPlugin(const std::string& mime_type,
                   const std::string& language,
                   const FindPluginCallback& found_callback,
                   const base::Closure& not_found_callback);
 
  private:
   friend struct DefaultSingletonTraits<PluginFinder>;
 
   PluginFinder();
   ~PluginFinder();
 
   scoped_ptr<base::ListValue> plugin_list_;
+  std::map<std::string, PluginInstaller*> installers_;
 
   DISALLOW_COPY_AND_ASSIGN(PluginFinder);
 };
 
 #endif  // CHROME_BROWSER_PLUGIN_FINDER_H_