Linux: add an extra CHECK to try and figure out bugs 75508 and 84673. BUG=75508,84673
Linux: add an extra CHECK to try and figure out bugs 75508 and 84673.
BUG=75508,84673

Review URL: http://codereview.chromium.org/7066044

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@87588 0039d316-1c4b-4281-b951-d872f2087c98

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