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This CL cleans up checkout_presubmit_ash_chrome DEPS hook because all
CI/CQ builders have been switched to build ash-chrome from ToT.

Bug: 1129223
Change-Id: I9de1f832ae29d3fe7eea85d67cd822b8c999c767
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2518080
Commit-Queue: Yuke Liao <liaoyuke@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@google.com>
Reviewed-by: Sven Zheng <svenzheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825579}