Fix conversion to WebServiceWorkerResponse headers.

Source/modules/serviceworkers/Response.cpp

Index: Source/modules/serviceworkers/Response.cpp
diff --git a/Source/modules/serviceworkers/Response.cpp b/Source/modules/serviceworkers/Response.cpp
index 691a6f1d830a95d6ab6da886c86252ed2d440ce3..3d9345633004242dba81e1e258b2ccfa2a2e63e6 100644
--- a/Source/modules/serviceworkers/Response.cpp
+++ b/Source/modules/serviceworkers/Response.cpp
@@ -36,7 +36,7 @@ Headers* createHeadersFromWebResponse(const WebServiceWorkerResponse& webRespons
 {
     Headers* headers = Headers::create();
     TrackExceptionState exceptionState;
-    for (HashMap<String, String>::const_iterator i = webResponse.headers().begin(), end = webResponse.headers().end(); i != end; ++i) {
+    for (HTTPHeaderMap::const_iterator i = webResponse.headers().begin(), end = webResponse.headers().end(); i != end; ++i) {
         headers->append(i->key, i->value, exceptionState);
         if (exceptionState.hadException())
             return 0;