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 45dd8a0e991870a8dad6293ec9cfefea410871ee..f71ae27ea0500e2b10f16e2238925008b5eb0da4 100644
--- a/Source/core/dom/TreeScope.cpp
+++ b/Source/core/dom/TreeScope.cpp
@@ -351,8 +351,9 @@ 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.

[dcheng, 2014/03/17 18:17:44]

I don't really understand what this comment has to do with the changes here. It
doesn't look like we're doing anything with the frame tree here?

[kenrb, 2014/03/18 20:01:19]

I've expanded the comment. focusedFrameOwnerElement can't be changed to take a
Frame instead of a LocalFrame until FrameTree works with Frames.

     if (!element && document.page())
-        element = focusedFrameOwnerElement(document.page()->focusController().focusedFrame(), document.frame());
+        element = focusedFrameOwnerElement(toLocalFrame(document.page()->focusController().focusedFrame()), document.frame());
     if (!element)
         return 0;