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When we added LASTCHANGE.committime in r583420, we missed a
case where we might not write it in the hook, and in that
situation the build would fail due to the file being missing.

TBR=thakis@chromium.org
BUG=875039

Change-Id: I5c596f55fe90bc5f5175c74ba27e218f108f843b
Reviewed-on: https://chromium-review.googlesource.com/1178892Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Dirk Pranke <dpranke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583852}