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In a previous CL, we made it so that changes to the keyboard window
bounds automatically call NotifyKeyboardBoundsChanged. Now we can
remove these extraneous calls and make NotifyKeyboardBoundsChanged
private.

TBR=jamescook@chromium.org

Bug: 845780
Change-Id: I191a22fc50e37a3c57552169f05f609f4fba3005
Reviewed-on: https://chromium-review.googlesource.com/1156114
Commit-Queue: Darren Shen <shend@chromium.org>
Reviewed-by: Darren Shen <shend@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580079}