Remove plugin_list.h includes from chrome tests in preparation for moving webkit/plugins to content…

chrome/browser/printing/print_preview_test.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_PRINTING_PRINT_PREVIEW_TEST_H_
 #define CHROME_BROWSER_PRINTING_PRINT_PREVIEW_TEST_H_
 
 #include "chrome/test/base/browser_with_test_window_test.h"
-#include "webkit/plugins/npapi/mock_plugin_list.h"
 
 class PrintPreviewTest : public BrowserWithTestWindowTest {
  public:
   PrintPreviewTest();
   virtual ~PrintPreviewTest();
 
  protected:
   virtual void SetUp() OVERRIDE;
 
   // Create a browser window to provide parenting for web contents modal dialog.
   virtual BrowserWindow* CreateBrowserWindow() OVERRIDE;
 
  private:
-  webkit::npapi::MockPluginList plugin_list_;
-
   DISALLOW_COPY_AND_ASSIGN(PrintPreviewTest);
 };
 
 #endif  // CHROME_BROWSER_PRINTING_PRINT_PREVIEW_TEST_H_