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 12f842cc01ce4176c34c05400045f80e6f548e78..3f46014c71461bdef448cc1709b6758c31bcdbd0 100644
--- a/Source/core/frame/RemoteFrame.cpp
+++ b/Source/core/frame/RemoteFrame.cpp
@@ -152,6 +152,13 @@ void RemoteFrame::createView()
     }
 }
 
+void RemoteFrame::close()
+{
+    // window.close only makes sense on a top-level frame.
+    if (!tree().parent())
+        remoteFrameClient()->close();
+}
+
 RemoteFrameClient* RemoteFrame::remoteFrameClient() const
 {
     return static_cast<RemoteFrameClient*>(client());