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This param was only being used to check for --single-process mode,
which can be done via a static function on RenderProcessHost instead.
This CL will simplify some of the plumbing in a later CL for locking
hosted apps to an origin (https://crrev.com/c/959346).

Bug: 791796
Change-Id: I0ef1e8f3a4a00f80e74f1109a092b795f3c63722
Reviewed-on: https://chromium-review.googlesource.com/1176216Reviewed-by: Łukasz Anforowicz <lukasza@chromium.org>
Commit-Queue: Alex Moshchuk <alexmos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583376}