Revert of [Android] Enable multidex for release builds of chrome_public_test_apk. (patchset #4 id:60001 of https://codereview.chromium.org/2836723002/ )

Reason for revert:
Breaks on O.

Original issue's description:
> [Android] Enable multidex for release builds of chrome_public_test_apk.
>
> BUG=712852
>
> Review-Url: https://codereview.chromium.org/2836723002
> Cr-Commit-Position: refs/heads/master@{#466659}
> Committed: https://chromium.googlesource.com/chromium/src/+/026ed39fd157f3afe2a6315571ddbc1012f9061e

TBR=agrieve@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=712852

Review-Url: https://codereview.chromium.org/2837123003
Cr-Commit-Position: refs/heads/master@{#466791}
11 files changed