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

public/platform/WebServiceWorkerRequest.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 WebServiceWorkerRequest_h
 #define WebServiceWorkerRequest_h
 
 #include "WebCommon.h"
 #include "public/platform/WebPrivatePtr.h"
+#include "public/platform/WebReferrerPolicy.h"
 #include "public/platform/WebString.h"
 #include "public/platform/WebURL.h"
 
 #if INSIDE_BLINK
+#include "platform/network/HTTPHeaderMap.h"
+#include "platform/weborigin/Referrer.h"
 #include "wtf/Forward.h"
-#include "wtf/HashMap.h"
 #include "wtf/text/StringHash.h"
+#include <utility>
 #endif
 
 namespace blink {
 
 class WebServiceWorkerRequestPrivate;
 
 // Represents a request of a fetch operation. FetchEvent dispatched by the
 // browser contains this. The plan is for the Cache and fetch() API to also use
 // it.
 class BLINK_PLATFORM_EXPORT WebServiceWorkerRequest {
@@ skipping 10 matching lines @@
     void assign(const WebServiceWorkerRequest&);
 
     void setURL(const WebURL&);
     WebURL url() const;
 
     void setMethod(const WebString&);
     WebString method() const;
 
     void setHeader(const WebString& key, const WebString& value);
 
+    void setReferrer(const WebString&, WebReferrerPolicy);
+
     void setIsReload(bool);
     bool isReload() const;
 
 #if INSIDE_BLINK
-    const HashMap<String, String>& headers() const;
+    const WebCore::HTTPHeaderMap& headers() const;
+    const WebCore::Referrer& referrer() const;
 #endif
 
 private:
     WebPrivatePtr<WebServiceWorkerRequestPrivate> m_private;
 };
 
 } // namespace blink
 
 #endif // WebServiceWorkerRequest_h