Updating trunk VERSION from 3748.0 to 3749.0

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

Change-Id: I62f20c327c6ee780d10bc0806bf14bc2dbc35da3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1540660Reviewed-by: chrome-release-bot@chromium.org <chrome-release-bot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#644668}

chrome/VERSION

 MAJOR=75
 MINOR=0
-BUILD=3748
+BUILD=3749
 PATCH=0