Revert of Add a mojo shell service to render frames (patchset #3 id:160001 of https...

Revert of Add a mojo shell service to render frames (patchset #3 id:160001 of https://codereview.chromium.org/1164163002/)

Reason for revert:
Broke MSan bot for confusing reasons.

Original issue's description:
> Add a mojo shell service to render frames
>
> This adds a Shell service to each render frame's service
> registry, allowing frames to connect to Mojo applications.
> When connecting to an application, the frame identifies
> itself using its SiteInstance's URL.
>
> BUG=497474
>
> Committed: https://crrev.com/89b0cc457ff83154f80709d9b58575047845730e
> Cr-Commit-Position: refs/heads/master@{#333312}

TBR=jam@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=497474

Review URL: https://codereview.chromium.org/1169933002

Cr-Commit-Position: refs/heads/master@{#333342}