chrome: Cleanup class/struct forward declarations

chrome/browser/chromeos/extensions/virtual_keyboard_browsertest.h

 // Copyright 2014 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_CHROMEOS_EXTENSIONS_VIRTUAL_KEYBOARD_BROWSERTEST_H_
 #define CHROME_BROWSER_CHROMEOS_EXTENSIONS_VIRTUAL_KEYBOARD_BROWSERTEST_H_
 
 #include "base/files/file_path.h"
 #include "chrome/test/base/in_process_browser_test.h"
 #include "url/gurl.h"
 
 namespace base {
 class CommandLine;
 class FilePath;
 }
 
 namespace content {
 class RenderViewHost;
-class WebContents;
 }
 
 // See the .cc for default values.
 struct VirtualKeyboardBrowserTestConfig {
   VirtualKeyboardBrowserTestConfig();
 
   ~VirtualKeyboardBrowserTestConfig();
 
   // The filename of the base framework. This file should be in |test_dir_|.
   std::string base_framework_;
@@ skipping 27 matching lines @@
  protected:
   // Accumulates the javascript and injects it when the test starts. The test
   // |file| is in directory |dir| relative to the root testing directory.
   void InjectJavascript(const base::FilePath& dir, const base::FilePath& file);
 
  private:
   std::string utf8_content_;
 };
 
 #endif  // CHROME_BROWSER_CHROMEOS_EXTENSIONS_VIRTUAL_KEYBOARD_BROWSERTEST_H_