Revert of Run webgl_conformance with the Android WebView shell (patchset #1 id:1...

Revert of Run webgl_conformance with the Android WebView shell (patchset #1 id:1 of https://codereview.chromium.org/1126793005/)

Reason for revert:
Doesn't work on the bot. Works locally. No idea.

Original issue's description:
> Run webgl_conformance with the Android WebView shell
>
> This adds a build step to run conformance with the
> webview shell, which exercises very different codepaths
>
> NOTRY=True (There are no trybots for this)
>
> BUG=420707
> R=kbr@chromium.org, navabi@chromium.org, navabi@google.com
>
> Committed: https://chromium.googlesource.com/chromium/src/+/f3abeea37887a3e4fa22060c3683304bcc93c06b

TBR=kbr@chromium.org,boliu@chromium.org,navabi@chromium.org,navabi@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=420707

Review URL: https://codereview.chromium.org/1119283005

Cr-Commit-Position: refs/heads/master@{#328409}