Re-enable file browser tests on chromeos
Re-enable file browser tests on chromeos

This enables file browser tests on chromeos. The test api has been fixed.

BUG=24257

TBR=dgozman@chromium.org
R=dgozman@chromium.org
TEST=

Review URL: https://chromiumcodereview.appspot.com/9243027

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@118143 0039d316-1c4b-4281-b951-d872f2087c98

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