Have Frame::loader() return a reference

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 df87469d85aae31624972f945f070ae80e969f90..738d83f14d8ecc959ff03f2d7667515e0280e891 100644
--- a/Source/modules/serviceworkers/NavigatorServiceWorker.cpp
+++ b/Source/modules/serviceworkers/NavigatorServiceWorker.cpp
@@ -74,7 +74,7 @@ WebServiceWorkerProvider* NavigatorServiceWorker::ensureProvider()
     if (!m_provider) {
         Frame* frame = m_navigator->frame();
 
-        FrameLoaderClient* client = frame->loader()->client();
+        FrameLoaderClient* client = frame->loader().client();
         // FIXME: This is temporarily hooked up here until we hook up to the loading process.
         m_provider = client->createServiceWorkerProvider(nullptr);
     }