Add some includes to web_url_loader_impl.

content/child/web_url_loader_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 CONTENT_CHILD_WEB_URL_LOADER_IMPL_H_
 #define CONTENT_CHILD_WEB_URL_LOADER_IMPL_H_
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "content/common/content_export.h"
 #include "third_party/WebKit/public/platform/WebURLLoader.h"
 
+class GURL;
+
 namespace content {
 
 class ResourceDispatcher;
 struct ResourceResponseInfo;
 
 class CONTENT_EXPORT WebURLLoaderImpl
     : public NON_EXPORTED_BASE(blink::WebURLLoader) {
  public:
   explicit WebURLLoaderImpl(ResourceDispatcher* resource_dispatcher);
   virtual ~WebURLLoaderImpl();
@@ skipping 25 matching lines @@
  private:
   class Context;
   scoped_refptr<Context> context_;
 
   DISALLOW_COPY_AND_ASSIGN(WebURLLoaderImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_WEB_URL_LOADER_IMPL_H_