Have Frame::loader() return a reference

Source/core/page/EventHandler.cpp

Index: Source/core/page/EventHandler.cpp
diff --git a/Source/core/page/EventHandler.cpp b/Source/core/page/EventHandler.cpp
index 3078f200200c673e1b38f785c24af2499bf99b70..41d6db3f4c07eabf8245349547b02ad7a03bef8a 100644
--- a/Source/core/page/EventHandler.cpp
+++ b/Source/core/page/EventHandler.cpp
@@ -3417,7 +3417,7 @@ void EventHandler::defaultBackspaceEventHandler(KeyboardEvent* event)
     Page* page = m_frame->page();
     if (!page)
         return;
-    bool handledEvent = page->mainFrame()->loader()->client()->navigateBackForward(event->shiftKey() ? 1 : -1);
+    bool handledEvent = page->mainFrame()->loader().client()->navigateBackForward(event->shiftKey() ? 1 : -1);
     if (handledEvent)
         event->setDefaultHandled();
 }