chrome: Cleanup class/struct forward declarations

chrome/test/chromedriver/chrome/chrome_impl.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_TEST_CHROMEDRIVER_CHROME_CHROME_IMPL_H_
 #define CHROME_TEST_CHROMEDRIVER_CHROME_CHROME_IMPL_H_
 
 #include <list>
 #include <memory>
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/memory/linked_ptr.h"
 #include "base/memory/scoped_vector.h"
 #include "chrome/test/chromedriver/chrome/chrome.h"
 
-class AutomationExtension;
 struct BrowserInfo;
 class DevToolsClient;
 class DevToolsEventListener;
 class DevToolsHttpClient;
-class JavaScriptDialogManager;
 class PortReservation;
 class Status;
 class WebView;
 class WebViewImpl;
-struct WebViewInfo;
 class WebViewsInfo;
 
 class ChromeImpl : public Chrome {
  public:
   ~ChromeImpl() override;
 
   // Overridden from Chrome:
   Status GetAsDesktop(ChromeDesktopImpl** desktop) override;
   const BrowserInfo* GetBrowserInfo() const override;
   bool HasCrashedWebView() override;
@@ skipping 26 matching lines @@
   void UpdateWebViews(const WebViewsInfo& views_info);
 
   // Web views in this list are in the same order as they are opened.
   WebViewList web_views_;
   ScopedVector<DevToolsEventListener> devtools_event_listeners_;
   std::unique_ptr<PortReservation> port_reservation_;
   std::string page_load_strategy_;
 };
 
 #endif  // CHROME_TEST_CHROMEDRIVER_CHROME_CHROME_IMPL_H_