1. Go to http://www.irs.gov/pub/irs-pdf/fw4.pdf
2. Press Ctrl+W
The WKView gets destroyed but its parent window doesn't close.
Adobe Reader is sending the WKView a WM_CLOSE message when the user presses Ctrl+W. WKView doesn't handle WM_CLOSE, so it gets passed along to ::DefWindowProcW, which turns around and calls ::DestroyWindow. But the UI client never gets to find out about any of this.
Created attachment 71393 [details]
Ask the UI client to close the page when the WKView receives a WM_CLOSE message
Committed r70247: <http://trac.webkit.org/changeset/70247>