Fix null reference in Chrome OS language settings.
Fix null reference in Chrome OS language settings.

BUG=chromium-os:14144, chromium-os:14309
TEST=verified null reference is not output in logs after language settings screen is first opened, and that modifier keys setting is saved

Review URL: http://codereview.chromium.org/6881077

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@82262 0039d316-1c4b-4281-b951-d872f2087c98

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