Moved the following IPC messages used by the chrome NPAPI plugin installer out of content

chrome/browser/plugin_installer_infobar_delegate.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_INSTALLER_INFOBAR_DELEGATE_H_
 #define CHROME_BROWSER_PLUGIN_INSTALLER_INFOBAR_DELEGATE_H_
 #pragma once
 
 #include "chrome/browser/tab_contents/confirm_infobar_delegate.h"
+#include "ui/gfx/native_widget_types.h"
 
 class TabContents;
 
 // The main purpose for this class is to popup/close the infobar when there is
 // a missing plugin.
 class PluginInstallerInfoBarDelegate : public ConfirmInfoBarDelegate {
  public:
-  explicit PluginInstallerInfoBarDelegate(TabContents* tab_contents);
+  PluginInstallerInfoBarDelegate(TabContents* tab_contents,
+                                 gfx::NativeWindow window);
 
  private:
   virtual ~PluginInstallerInfoBarDelegate();
 
   // ConfirmInfoBarDelegate:
   virtual gfx::Image* GetIcon() const OVERRIDE;
   virtual PluginInstallerInfoBarDelegate*
       AsPluginInstallerInfoBarDelegate() OVERRIDE;
   virtual string16 GetMessageText() const OVERRIDE;
   virtual int GetButtons() const OVERRIDE;
   virtual string16 GetButtonLabel(InfoBarButton button) const OVERRIDE;
   virtual bool Accept() OVERRIDE;
   virtual string16 GetLinkText() const OVERRIDE;
   virtual bool LinkClicked(WindowOpenDisposition disposition) OVERRIDE;
 
   // The containing TabContents
   TabContents* tab_contents_;
+  gfx::NativeWindow window_;
 
   DISALLOW_COPY_AND_ASSIGN(PluginInstallerInfoBarDelegate);
 };
 
 #endif  // CHROME_BROWSER_PLUGIN_INSTALLER_INFOBAR_DELEGATE_H_