GitLab

|SetDraggableArea| returns checks if the container behavior is null,
but KeyboardController always has a container behavior (initialised in
the constructor).

This patch removes the container behavior null check.

Bug: 845780
Change-Id: Iaa21bd8179a7fb88a0dd277f4888ae778c624d99
Reviewed-on: https://chromium-review.googlesource.com/1069950
Commit-Queue: Darren Shen <shend@chromium.org>
Reviewed-by: Yuichiro Hanada <yhanada@chromium.org>
Cr-Commit-Position: refs/heads/master@{#560995}