WebView: Cleanup class/struct forward declarations

android_webview/browser/net/aw_network_delegate.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 ANDROID_WEBVIEW_BROWSER_NET_AW_NETWORK_DELEGATE_H_
 #define ANDROID_WEBVIEW_BROWSER_NET_AW_NETWORK_DELEGATE_H_
 
 #include "base/macros.h"
 #include "net/base/network_delegate_impl.h"
 
 namespace net {
-class ProxyInfo;
 class URLRequest;
 }
 
 namespace policy {
 class URLBlacklistManager;
 }
 
 namespace android_webview {
 
 // WebView's implementation of the NetworkDelegate.
@@ skipping 41 matching lines @@
 
   // Used to filter URL requests. Owned by AwBrowserContext.
   const policy::URLBlacklistManager* url_blacklist_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(AwNetworkDelegate);
 };
 
 }  // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_BROWSER_NET_AW_NETWORK_DELEGATE_H_