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Revert of Content Shell: Introduce LayoutTestBrowserContext. (patchset #2 id:20001 of https://codereview.chromium.org/637843003/)

Reason for revert:
Tentatively resulted in multiple layout test timeouts across the chromium.webkit waterfall.

Original issue's description:
> Content Shell: Introduce LayoutTestBrowserContext.
>
> This splits the DRT-specific parts of ShellBrowserContext out into a new
> class that we'll only instantiate when the flag is set.
>
> BUG=420994
>
> Committed: https://crrev.com/98ce5ad6bdd2cd058c21f19b997032f3b958cb73
> Cr-Commit-Position: refs/heads/master@{#299068}

TBR=jochen@chromium.org,mkwst@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=420994

Review URL: https://codereview.chromium.org/641203004

Cr-Commit-Position: refs/heads/master@{#299077}