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OfflinePageRequestJob and OfflinePageURLLoader (will be added in next
patch to support network servicification) will create and hold
OfflinePageRequestHandler. The specific behaviors for url request job
and url loader are encapsulated in OfflinePageRequestHandler::Delegate
which will be implemented accordingly.

OfflinePageRequestHandlerTest is also to pull out common testing code.
For now, only one type OfflinePageRequestJobBuilder is added to test
OfflinePageRequestJob. I will add a new type to test new URLLoader in
next patch.


Bug: 841617
Change-Id: I1cd9b8e03358bc18d6d08e2d038be579de10dc42
Reviewed-on: https://chromium-review.googlesource.com/1058449
Commit-Queue: Jian Li <jianli@chromium.org>
Reviewed-by: Dmitry Titov <dimich@chromium.org>
Cr-Commit-Position: refs/heads/master@{#560715}