Remove unused WebURLRequestExtraData class

sky/viewer/platform/weburlloader_impl.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 SKY_VIEWER_PLATFORM_WEBURLLOADER_IMPL_H_
 #define SKY_VIEWER_PLATFORM_WEBURLLOADER_IMPL_H_
 
 #include "base/memory/weak_ptr.h"
 #include "mojo/common/handle_watcher.h"
 #include "mojo/services/network/public/interfaces/url_loader.mojom.h"
 #include "sky/engine/public/platform/WebURLLoader.h"
 #include "sky/engine/public/platform/WebURLRequest.h"
 
 namespace mojo {
 class NetworkService;
 }
 
 namespace sky {
-// The concrete type of WebURLRequest::ExtraData.
-class WebURLRequestExtraData : public blink::WebURLRequest::ExtraData {
- public:
-  WebURLRequestExtraData();
-  virtual ~WebURLRequestExtraData();
-
-  mojo::URLResponsePtr synthetic_response;
-};
 
 class WebURLLoaderImpl : public blink::WebURLLoader {
  public:
   explicit WebURLLoaderImpl(mojo::NetworkService* network_service);
 
  private:
   virtual ~WebURLLoaderImpl();
 
   // blink::WebURLLoader methods:
   virtual void loadAsynchronously(
@@ skipping 14 matching lines @@
   mojo::common::HandleWatcher handle_watcher_;
 
   base::WeakPtrFactory<WebURLLoaderImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WebURLLoaderImpl);
 };
 
 }  // namespace sky
 
 #endif  // SKY_VIEWER_PLATFORM_WEBURLLOADER_IMPL_H_