Convert HTMLFrameOwnerElement and FocusController to use Frame.

Source/core/dom/TreeScope.cpp

Index: Source/core/dom/TreeScope.cpp
diff --git a/Source/core/dom/TreeScope.cpp b/Source/core/dom/TreeScope.cpp
index ed11d7efbffaedf6e3d1bff1253bc5ca4be2eac0..9c73d052a93c05a61a481e16da9b26c8bf2d7b13 100644
--- a/Source/core/dom/TreeScope.cpp
+++ b/Source/core/dom/TreeScope.cpp
@@ -345,8 +345,10 @@ Element* TreeScope::adjustedFocusedElement() const
 {
     Document& document = rootNode().document();
     Element* element = document.focusedElement();
+    // FIXME(kenrb): The toLocalFrame() cast should be removed when RemoteFrames can have FrameTrees.
+    // At that point, focusedFrameOwnerElement should take a Frame instead of a LocalFrame.
     if (!element && document.page())
-        element = focusedFrameOwnerElement(document.page()->focusController().focusedFrame(), document.frame());
+        element = focusedFrameOwnerElement(toLocalFrameTemporary(document.page()->focusController().focusedFrame()), document.frame());
     if (!element)
         return 0;