[ServiceWorker] Add setURL() and url() to WebServiceWorkerResponse.

public/platform/WebServiceWorkerResponse.h

Index: public/platform/WebServiceWorkerResponse.h
diff --git a/public/platform/WebServiceWorkerResponse.h b/public/platform/WebServiceWorkerResponse.h
index 30b82ad2e9ae8f0b921ce59f5720856e0b6deb2c..95894c65eaacc3ae66815620575769299c4b6ca8 100644
--- a/public/platform/WebServiceWorkerResponse.h
+++ b/public/platform/WebServiceWorkerResponse.h
@@ -8,6 +8,7 @@
 #include "WebCommon.h"
 #include "public/platform/WebPrivatePtr.h"
 #include "public/platform/WebString.h"
+#include "public/platform/WebURL.h"
 #include "public/platform/WebVector.h"
 
 #if INSIDE_BLINK
@@ -40,6 +41,9 @@ public:
     void reset();
     void assign(const WebServiceWorkerResponse&);
 
+    void setURL(const WebURL&);
+    WebURL url() const;
+
     void setStatus(unsigned short);
     unsigned short status() const;