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This CL changes how SharedWorkers create their URLLoaderFactory:

1. Ad-hoc creation code is replaced with a call into
   RenderProcessHost::CreateURLLoaderFactory, which
   1.1. Sets |request_initiator_site_lock| to the right origin,
   1.2. Sets |is_corb_enabled| to true.

2. Code is integrated with URLLoaderInterceptor (at least if the
   NetworkService is enabled) which helps test the changes wrt
   their impact on CORB behavior.

This CL also tweaks RequestInterceptor used by various CORB tests, so
that it forwards the actual headers / body / error-code of the response
(previously the renderer was always told that the response errored out
with ERR_NOT_IMPLEMENTED code).

Bug: 927849
Change-Id: Ic4c673d2f9c74fd89b8482552b7b72346f783c44
Reviewed-on: https://chromium-review.googlesource.com/c/1450430
Commit-Queue: Łukasz Anforowicz <lukasza@chromium.org>
Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#630058}