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OfflinePageRequestJob does not derive from URLRequestFileJob any more.
Instead, the file reading logic in URLRequestFileJob is integrated into
OfflinePageRequestJob such that the file can be opened and held for both
validation and reading.

Bug: 758690
Change-Id: Id33533316b79a919a365991aa0173bc8c71b5e4f
Reviewed-on: https://chromium-review.googlesource.com/865757Reviewed-by: Dmitry Titov <dimich@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Commit-Queue: Jian Li <jianli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532055}