Remove 10.9 code.

BUG=840435

Change-Id: I9269e6ff0a063fcad38e74b3b04861b8a2a9694c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1600537
Commit-Queue: Avi Drissman <avi@chromium.org>
Auto-Submit: Avi Drissman <avi@chromium.org>
Reviewed-by: Mark Mentovai <mark@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#657756}
8 files changed