Convert HTMLFrameOwnerElement and FocusController to use Frame.

Source/web/WebFrameImpl.cpp

Index: Source/web/WebFrameImpl.cpp
diff --git a/Source/web/WebFrameImpl.cpp b/Source/web/WebFrameImpl.cpp
index 4a1f80bbcee1f567ab855ad9d1193e18b814c748..11949ac7149c637a1536139147cfda56fe6dbb5a 100644
--- a/Source/web/WebFrameImpl.cpp
+++ b/Source/web/WebFrameImpl.cpp
@@ -760,7 +760,7 @@ WebFrame* WebFrameImpl::findChildByExpression(const WebString& xpath) const
     Node* node = xpathResult->iterateNext(IGNORE_EXCEPTION);
     if (!node || !node->isFrameOwnerElement())
         return 0;
-    return fromFrame(toHTMLFrameOwnerElement(node)->contentFrame());
+    return fromFrame(toLocalFrame(toHTMLFrameOwnerElement(node)->contentFrame()));
 }
 
 WebDocument WebFrameImpl::document() const
@@ -2226,7 +2226,7 @@ WebFrameImpl* WebFrameImpl::fromFrameOwnerElement(Element* element)
     // FIXME: Why do we check specifically for <iframe> and <frame> here? Why can't we get the WebFrameImpl from an <object> element, for example.
     if (!element || !element->isFrameOwnerElement() || (!element->hasTagName(HTMLNames::iframeTag) && !element->hasTagName(HTMLNames::frameTag)))
         return 0;
-    return fromFrame(toHTMLFrameOwnerElement(element)->contentFrame());
+    return fromFrame(toLocalFrame(toHTMLFrameOwnerElement(element)->contentFrame()));
 }
 
 WebViewImpl* WebFrameImpl::viewImpl() const