Move window.close implementation to DOMWindow

Source/core/frame/RemoteFrame.cpp

Index: Source/core/frame/RemoteFrame.cpp
diff --git a/Source/core/frame/RemoteFrame.cpp b/Source/core/frame/RemoteFrame.cpp
index c174cc73f17773feb8ed9e8c6fd2ba796f9e1840..b2ebd7d96138228e2e6fb12c46b2368ae7c9764e 100644
--- a/Source/core/frame/RemoteFrame.cpp
+++ b/Source/core/frame/RemoteFrame.cpp
@@ -120,6 +120,13 @@ void RemoteFrame::disconnectOwnerElement()
     Frame::disconnectOwnerElement();
 }
 
+bool RemoteFrame::shouldClose()
+{
+    // TODO(nasko): Implement running the beforeunload handler in the actual
+    // LocalFrame running in a different process and getting back a real result.
+    return true;
+}
+
 void RemoteFrame::forwardInputEvent(Event* event)
 {
     remoteFrameClient()->forwardInputEvent(event);