linux: remove the xmessage-based error dialog
linux: remove the xmessage-based error dialog

Since this is for developers only, developers use the console
anyway.  The dialog is cute but superfluous and actually kind
of annoying.

BUG=37026

Review URL: http://codereview.chromium.org/5905005

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@69484 0039d316-1c4b-4281-b951-d872f2087c98

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