Convert HTMLFrameOwnerElement and FocusController to use Frame.

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 f32a579c0cb86dbe09e7a2250c02e1d1e726b4f3..c8dd5592b7cb40519de63e06a0ff65e7650655e2 100644
--- a/Source/core/page/EventHandler.cpp
+++ b/Source/core/page/EventHandler.cpp
@@ -1714,7 +1714,7 @@ bool EventHandler::handlePasteGlobalSelection(const PlatformMouseEvent& mouseEve
 
     if (!m_frame->page())
         return false;
-    LocalFrame* focusFrame = m_frame->page()->focusController().focusedOrMainFrame();
+    Frame* focusFrame = m_frame->page()->focusController().focusedOrMainFrame();
     // Do not paste here if the focus was moved somewhere else.
     if (m_frame == focusFrame && m_frame->editor().behavior().supportsGlobalSelection())
         return m_frame->editor().command("PasteGlobalSelection").execute();
@@ -1750,7 +1750,11 @@ static bool targetIsFrame(Node* target, LocalFrame*& frame)
     if (!target->hasTagName(frameTag) && !target->hasTagName(iframeTag))
         return false;
 
-    frame = toHTMLFrameElementBase(target)->contentFrame();
+    // Cross-process drag and drop is not yet supported.
+    if (!toHTMLFrameElementBase(target)->contentFrame()->isLocalFrame())
+        return false;
+
+    frame = toLocalFrame(toHTMLFrameElementBase(target)->contentFrame());
     return true;
 }