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This regressed in r473830 (blurring the Omnibox then mouse-overing
resulted in an arrow cursor, not an I-beam). Now it properly deselects,
so the cursor shows as an I-beam again.

Bug: 740008
Change-Id: Ice2b4fdb21acf642bdf928c07c40beec5639274f
Reviewed-on: https://chromium-review.googlesource.com/563143
Commit-Queue: Matt Giuca <mgiuca@chromium.org>
Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487386}