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This CL adds caching of the online status in the RenderThread for each
renderer process to make it available to query on demand.
Without it, when navigation in a new process results in an error page,
the NetErrorHelper object is initialized with incorrect state, leading
to breakage of autoreload functionality when the browser is back online.

Bug: 865914
Change-Id: I9eb388ddd4f06a80f48d5c4f9c774ac4b29f5377
Reviewed-on: https://chromium-review.googlesource.com/1237143Reviewed-by: Matt Menke <mmenke@chromium.org>
Commit-Queue: Nasko Oskov <nasko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593819}