Revert of Installs test CA to android devices as part of browser startup so that...

Revert of Installs test CA to android devices as part of browser startup so that apps can be tested with prox… (patchset #8 id:140001 of https://codereview.chromium.org/572123002/)

Reason for revert:
Userdebug build perf bots are still missing dependencies:
ImportError: No module named OpenSSL

Also, we'll need to gracefully degrade on user builds:
CertInstallError: Cert Install Failed

Original issue's description:
> Installs test CA to android devices as part of browser startup so that apps can be tested with proxy HTTPS server without code changes.
>
> BUG=412826
>
> Committed: https://crrev.com/f28d9cace2df4a9dcaa992c4df5b85e3b2674dbb
> Cr-Commit-Position: refs/heads/master@{#296619}
>
> Committed: https://crrev.com/10eb77a2c2843664e7d55d8a4535d66b7f95d9c8
> Cr-Commit-Position: refs/heads/master@{#297653}

TBR=nednguyen@google.com,slamm@google.com,slamm@chromium.org,hjd@chromium.org,friedman@chromium.org,wuhu@google.com
NOTREECHECKS=true
NOTRY=true
BUG=412826

Review URL: https://codereview.chromium.org/617263004

Cr-Commit-Position: refs/heads/master@{#297697}