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This CL moves some common flag/switch wrappers into the callers to
remove unnecessary dependencies on keyboard_util.h. With the upcoming
Chrome/Ash separation, the wrappers cause more confusion than they
improve readability.

This CL also moves some keyboard_util.cc code only used in
KeyboardController to that class.

Bug: 843332
Change-Id: I042928bebfe4f9ea93ccb4fb7a24f8fc46f555cf
Reviewed-on: https://chromium-review.googlesource.com/1226191
Commit-Queue: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Darren Shen <shend@chromium.org>
Reviewed-by: Shu Chen <shuchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#592545}