Workaround for failing Aura browser tests.
Workaround for failing Aura browser tests.

With r119520, many browser_tests started failing on GYP_DEFINES="use_aura=1 chromeos=1" builds. This works around the problem (cause still unknown).

BUG=111929
TEST=Linux ChromeOS Aura bot goes green
TBR=jamesr

Review URL: https://chromiumcodereview.appspot.com/9264048

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@119733 0039d316-1c4b-4281-b951-d872f2087c98

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