Change FrameTree to return Frames instead of LocalFrames.

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 6399cf7372366dbbbc397398ad4b6ff7bf22c06b..47bb698eb4a4cd4251d1f5f141aa17e76aefac8c 100644
--- a/Source/core/dom/TreeScope.cpp
+++ b/Source/core/dom/TreeScope.cpp
@@ -346,7 +346,7 @@ void TreeScope::adoptIfNeeded(Node& node)
         adopter.execute();
 }
 
-static Element* focusedFrameOwnerElement(LocalFrame* focusedFrame, LocalFrame* currentFrame)
+static Element* focusedFrameOwnerElement(Frame* focusedFrame, Frame* currentFrame)
 {
     for (; focusedFrame; focusedFrame = focusedFrame->tree().parent()) {
         if (focusedFrame->tree().parent() == currentFrame) {
@@ -361,10 +361,8 @@ 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(toLocalFrameTemporary(document.page()->focusController().focusedFrame()), document.frame());
+        element = focusedFrameOwnerElement(document.page()->focusController().focusedFrame(), document.frame());
     if (!element)
         return 0;