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In preparation for moving ui/chromeos/ime to
chrome/browser/chromeos/input_method/ui, fix presubmit errors.

Change-Id: I576ef32b13bd74b18a2e942aa6a5b2f0aaa69884
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2228016Reviewed-by: Keith Lee <keithlee@chromium.org>
Commit-Queue: My Nguyen <myy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#775003}