Revert of [ios] Implemented LoadHtml w/o using data:// URLs. (patchset #4 id:60001 of https://codereview.chromium.org/2295053003/ )

Reason for revert:
Breaking iOS build.

Original issue's description:
> [ios] Implemented LoadHtml w/o using data:// URLs.
>
> This allows loading HTML and setting a specific URL (last part is needed
> by suggestions tests, which currently use private API to set the URL).
>
> BUG=619687
>
> Committed: https://crrev.com/7d93683d73e6bb131651275c752a0792f2733410
> Cr-Commit-Position: refs/heads/master@{#416151}

TBR=jyquinn@chromium.org,eugenebut@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=619687

Review-Url: https://codereview.chromium.org/2306053002
Cr-Commit-Position: refs/heads/master@{#416246}
6 files changed