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Primarily this is getting rid of the abstraction in AppCacheUpdateRequestBase
to either map to AppCacheUpdateURLRequest or AppCacheUpdateURLLoaderRequest.
I.e. this changes things such that requests made by the app cache code
always take the URLLoader code path, as that should work regardless of if
network service is enabled.

Everything else is just updating tests to work with these changes.

Bug: 925585
Change-Id: Icd4fc4510231efd4e49e5dda9bc25520f2817419
Reviewed-on: https://chromium-review.googlesource.com/c/1437325
Commit-Queue: Marijn Kruisselbrink <mek@chromium.org>
Auto-Submit: Marijn Kruisselbrink <mek@chromium.org>
Reviewed-by: Nicolas Ouellet-Payeur <nicolaso@chromium.org>
Reviewed-by: Victor Costan <pwnall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#627719}