gtk: swallow spurious error
gtk: swallow spurious error

We promote GTK errors into DFATALs.  Some versions of GTK accidentally
call it an error to not have an environment variable set.  They fixed
this on GTK trunk, but we shouldn't die on Ubuntu releases that don't
have the fix.

BUG=97293

Review URL: http://codereview.chromium.org/7983018

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@102021 0039d316-1c4b-4281-b951-d872f2087c98

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