Updating trunk VERSION from 3626.0 to 3627.0 and incrementing major version to 73

# This is an automated release commit.
# Do not revert without consulting chrome-pmo@google.com.
NOAUTOREVERT=true
TBR=benmason@chromium.org

Change-Id: I3425ada8dfe3c3e3376827f3db98260b6bc0760e
Reviewed-on: https://chromium-review.googlesource.com/c/1356266Reviewed-by: chrome-release-bot@chromium.org <chrome-release-bot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612556}

chrome/MAJOR_BRANCH_DATE

-MAJOR_BRANCH_DATE=2018-10-12
+MAJOR_BRANCH_DATE=2018-11-30

chrome/VERSION

-MAJOR=72
+MAJOR=73
 MINOR=0
-BUILD=3626
+BUILD=3627
 PATCH=0