Updating trunk VERSION from 3765.0 to 3766.0

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

Change-Id: I1c2979a8ea0945b9d392fd3d1a3d6512c056f790
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1566814Reviewed-by: chrome-release-bot@chromium.org <chrome-release-bot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#650637}

chrome/VERSION

 MAJOR=75
 MINOR=0
-BUILD=3765
+BUILD=3766
 PATCH=0