Show missing plug-in infobar only if a plug-in is available.

chrome/default_plugin/plugin_installer_base.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_DEFAULT_PLUGIN_PLUGIN_INSTALLER_BASE_H_
 #define CHROME_DEFAULT_PLUGIN_PLUGIN_INSTALLER_BASE_H_
 
 #include "base/basictypes.h"
 #include "third_party/npapi/bindings/npapi.h"
 
 // Base class for the plugin installer.
 class PluginInstallerBase {
  public:
   PluginInstallerBase();
   virtual ~PluginInstallerBase();
 
-  bool Initialize(void* module_handle, NPP instance, NPMIMEType mime_type,
-                  int16 argc, char* argn[], char* argv[]);
+  // Parses the arguments passed in to the plug-in for the IDs of the renderer
+  // process and RenderView.
+  void SetRoutingIds(int16 argc, char* argn[], char* argv[]);
 
   int renderer_process_id() const {
     return renderer_process_id_;
   }
 
   int render_view_id() const {
     return render_view_id_;
   }
 
  private:
   int renderer_process_id_;
   int render_view_id_;
 };
 
 #endif  // CHROME_DEFAULT_PLUGIN_PLUGIN_INSTALLER_BASE_H_