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git cl lint pointed TouchSelectionControllerImpl should include set.

Bug: None
Test: Build.
Change-Id: I8b78fbf36092116e35e287edb96557fc9be9f70d
Reviewed-on: https://chromium-review.googlesource.com/c/1297247Reviewed-by: Mohsen Izadi <mohsen@chromium.org>
Commit-Queue: David Jacobo <djacobo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#602390}