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This CL tries to speculatively avoid 1) cases where a
|direct_network_factory_| might be getting used with non-opaque origins
(see https://crbug.com/1105794) and 2) cases where a
|request_initiator_site_lock| doesn't match |request_initiator|.  We
speculate that one such case might occur when
RenderFrameObserver::ReadyToCommitNavigation triggers a fetch in a new
document *before* the new factories have been installed.

After this CL, the new factories are installed earlier, before calling
RenderFrameObserver::ReadyToCommitNavigation.

Bug: 1105794, 1098938, 920634, 1056949
Change-Id: I1f06750d4211e12d196eba0f3a78edeaeaa98cdf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2303678
Commit-Queue: Łukasz Anforowicz <lukasza@chromium.org>
Auto-Submit: Łukasz Anforowicz <lukasza@chromium.org>
Reviewed-by: Nasko Oskov <nasko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789714}