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diff --git a/webkit/child/weburlrequest_extradata_impl.h b/webkit/child/weburlrequest_extradata_impl.h
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+++ b/webkit/child/weburlrequest_extradata_impl.h
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+// 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 WEBKIT_CHILD_WEBURLREQUEST_EXTRADATA_IMPL_H_
+#define WEBKIT_CHILD_WEBURLREQUEST_EXTRADATA_IMPL_H_
+
+#include "base/compiler_specific.h"
+#include "third_party/WebKit/public/platform/WebReferrerPolicy.h"
+#include "third_party/WebKit/public/platform/WebString.h"
+#include "third_party/WebKit/public/platform/WebURLRequest.h"
+#include "webkit/child/webkit_child_export.h"
+
+namespace webkit_glue {
+
+// Base class for Chrome's implementation of the "extra data" stored in each
+// ResourceRequest.
+class WEBKIT_CHILD_EXPORT WebURLRequestExtraDataImpl :
+    public NON_EXPORTED_BASE(WebKit::WebURLRequest::ExtraData) {
+ public:
+  // |custom_user_agent| is used to communicate an overriding custom user agent
+  // to |RenderViewImpl::willSendRequest()|; set to a null string to indicate no
+  // override and an empty string to indicate that there should be no user
+  // agent. This needs to be here, instead of content's |RequestExtraData| since
+  // ppb_url_request_info_impl.cc needs to be able to set it.
+  explicit WebURLRequestExtraDataImpl(
+      WebKit::WebReferrerPolicy referrer_policy,
+      const WebKit::WebString& custom_user_agent);
+  virtual ~WebURLRequestExtraDataImpl();
+
+  WebKit::WebReferrerPolicy referrer_policy() const { return referrer_policy_; }
+  const WebKit::WebString& custom_user_agent() const {
+    return custom_user_agent_;
+  }
+
+ private:
+  WebKit::WebReferrerPolicy referrer_policy_;
+  WebKit::WebString custom_user_agent_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebURLRequestExtraDataImpl);
+};
+
+}  // namespace webkit_glue
+
+#endif  // WEBKIT_CHILD_WEBURLREQUEST_EXTRADATA_IMPL_H_