Presubmit: Warn about using XSelectInput

New code running in the browser process should always use
ui::XScopedEventSelector instead of XSelectInput.

BUG=634084

Review-Url: https://codereview.chromium.org/2316373003
Cr-Commit-Position: refs/heads/master@{#418653}
1 file changed