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This CL introduces a new member to HttpCache::Transaction, called
|updated_prefetch_response_|. This response is optionally a copy of
|response_|, used when writing modified values on prefetch responses
for future transactions. This is used instead of the current flow of:
 - Modifying |response_|
 - Writing it
 - Un-modifying it for the current transaction

Furthermore, when |updated_prefetch_response_| is non-null,
WriteResponseInfoToEntry prefers writing this response to |response_|.

Bug: 939317
Change-Id: Ic92683411f495b99fca22a675191b050edd72a02
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1760632
Commit-Queue: Dominic Farolino <dom@chromium.org>
Reviewed-by: Josh Karlin <jkarlin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#691520}