Move window.close implementation to DOMWindow

Source/core/frame/LocalFrame.cpp

Index: Source/core/frame/LocalFrame.cpp
diff --git a/Source/core/frame/LocalFrame.cpp b/Source/core/frame/LocalFrame.cpp
index 3e97c088adcab4c8129c80b777867bfe3bb98146..d11d1f74a4609fdcb0c9878323255e41ab740442 100644
--- a/Source/core/frame/LocalFrame.cpp
+++ b/Source/core/frame/LocalFrame.cpp
@@ -350,6 +350,13 @@ void LocalFrame::disconnectOwnerElement()
     Frame::disconnectOwnerElement();
 }
 
+bool LocalFrame::shouldClose()
+{
+    // TODO(dcheng): This should be fixed to dispatch beforeunload events to
+    // both local and remote frames.
+    return m_loader.shouldClose();
+}
+
 void LocalFrame::willDetachFrameHost()
 {
     LocalFrameLifecycleNotifier::notifyWillDetachFrameHost();