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InitDataReductionProxySettings constructs DataReductionProxyService, which later on
is provides data to DataReductionProxyIOData to construct DataReductionProxyConfig.
Ultimately, DataReductionProxyConfig constructs WarmupURLFetcher instances.

This CL is a preparation CL for [1], where we migrate WarmupURLFetcher from
URLFetcher to SimpleURLLoader. In [1], |url loader factory| is mandatory to be non-null.
Passing an actual instance at the beginning of the call chain now
has no immediate effect, but is harmless too.

[1] https://crrev.com/c/1251641

BUG=879777

Change-Id: I3f3009e6e6d9db9659e7783cbed65a1a82c6a34e
Reviewed-on: https://chromium-review.googlesource.com/1256945Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Commit-Queue: Antonio Gomes <tonikitoo@igalia.com>
Cr-Commit-Position: refs/heads/master@{#595858}