Use caller's document url to resolve scriptURL/patternURL in registerServiceWorker/getRegistration

Source/modules/serviceworkers/NavigatorServiceWorker.cpp

Index: Source/modules/serviceworkers/NavigatorServiceWorker.cpp
diff --git a/Source/modules/serviceworkers/NavigatorServiceWorker.cpp b/Source/modules/serviceworkers/NavigatorServiceWorker.cpp
index 07e5136ee61f542f741e241c28e44d1a26bb42a5..86cb30d463f522484667677ffa1c041b88742f74 100644
--- a/Source/modules/serviceworkers/NavigatorServiceWorker.cpp
+++ b/Source/modules/serviceworkers/NavigatorServiceWorker.cpp
@@ -15,6 +15,7 @@ namespace blink {
 
 NavigatorServiceWorker::NavigatorServiceWorker(Navigator& navigator)
     : DOMWindowProperty(navigator.frame())
+    , m_domWindow(navigator.frame()->domWindow())
 {
 }
 
@@ -57,9 +58,9 @@ ServiceWorkerContainer* NavigatorServiceWorker::serviceWorker(Navigator& navigat
 
 ServiceWorkerContainer* NavigatorServiceWorker::serviceWorker()
 {
-    if (!m_serviceWorker && frame()) {
-        ASSERT(frame()->domWindow());
-        m_serviceWorker = ServiceWorkerContainer::create(frame()->domWindow()->executionContext());
+    if (!m_serviceWorker && m_domWindow) {
+        ASSERT(m_domWindow->executionContext());
+        m_serviceWorker = ServiceWorkerContainer::create(m_domWindow->executionContext());
     }
     return m_serviceWorker.get();
 }