Convert page-level classes to handle RemoteFrames from FrameTree

Source/core/page/CreateWindow.cpp

Index: Source/core/page/CreateWindow.cpp
diff --git a/Source/core/page/CreateWindow.cpp b/Source/core/page/CreateWindow.cpp
index 7068fd93bf124fd535ca0edcc45ab7f58387e5ff..bc8ac81b5d4da0cb56cd38f3a177b5110a5630c2 100644
--- a/Source/core/page/CreateWindow.cpp
+++ b/Source/core/page/CreateWindow.cpp
@@ -66,6 +66,8 @@ static LocalFrame* createWindow(LocalFrame& openerFrame, LocalFrame& lookupFrame
 
     if (openerFrame.settings() && !openerFrame.settings()->supportsMultipleWindows()) {
         created = false;
+        if (!openerFrame.tree().top()->isLocalFrame())
+            return 0;
         return openerFrame.tree().top();

[dcheng, 2014/05/30 21:02:58]

Do we need to add a call to toLocalFrame() here?

[kenrb, 2014/05/30 21:43:27]

Yes, but there is a bit of a problem that I can't call toLocalFrame() directly
on a return value from FrameTree because the casting macros prevent trying to
cast LocalFrame* to LocalFrame*. There are only a few places like this, so I am
leaving them until the final CL where I actually change the return type.

     }