[ServiceWorker] Make Request class better conformance with the spec.

Source/platform/exported/WebServiceWorkerRequest.cpp

 // 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.
 
 #include "config.h"
 #include "public/platform/WebServiceWorkerRequest.h"
 
 namespace blink {
 
 class WebServiceWorkerRequestPrivate : public RefCounted<WebServiceWorkerRequestPrivate> {
 public:
     WebServiceWorkerRequestPrivate()
-        : isReload(false)
-    {
-    }
+        : isReload(false) { }
     WebURL url;
     WebString method;
-    HashMap<String, String> headers;
+    Vector<OwnPtr<WebServiceWorkerRequest::Header> > headerList;
+    WebString referrer;
     bool isReload;
 };
 
 WebServiceWorkerRequest::WebServiceWorkerRequest()
     : m_private(adoptRef(new WebServiceWorkerRequestPrivate))
 {
 }
 
 void WebServiceWorkerRequest::reset()
 {
@@ skipping 20 matching lines @@
     m_private->method = method;
 }
 
 WebString WebServiceWorkerRequest::method() const
 {
     return m_private->method;
 }
 
 void WebServiceWorkerRequest::setHeader(const WebString& key, const WebString& value)
 {
-    m_private->headers.set(key, value);
+    m_private->headerList.append(adoptPtr(new Header(key, value)));
 }
 
-const HashMap<String, String>& WebServiceWorkerRequest::headers() const
+const Vector<OwnPtr<WebServiceWorkerRequest::Header> >& WebServiceWorkerRequest::headerList() const
 {
-    return m_private->headers;
+    return m_private->headerList;
+}
+
+void WebServiceWorkerRequest::setReferrer(const WebString& referrer)
+{
+    m_private->referrer = referrer;
+}
+
+WebString WebServiceWorkerRequest::referrer() const
+{
+    return m_private->referrer;
 }
 
 void WebServiceWorkerRequest::setIsReload(bool isReload)
 {
     m_private->isReload = isReload;
 }
 
 bool WebServiceWorkerRequest::isReload() const
 {
     return m_private->isReload;
 }
 
 } // namespace blink