Updating trunk VERSION from 3857.0 to 3858.0

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

Change-Id: I7b7abc3c51a4cca358c6ff363298749008843f8a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1710188Reviewed-by: chrome-release-bot@chromium.org <chrome-release-bot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#678966}

chrome/VERSION

 MAJOR=77
 MINOR=0
-BUILD=3857
+BUILD=3858
 PATCH=0