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on Mac.  I'm leaving the window resizable for now, because I dislike
non-resizable windows.  This is easy enough to change later.

BUG=None
TEST=After bringing up the dialog, verify that the only way to dismiss
it is by pressing either the wait button or the kill button.
Review URL: http://codereview.chromium.org/151009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@20044 0039d316-1c4b-4281-b951-d872f2087c98