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This was computed in CommitNavigation(). We would like to expose the
sandbox flags to the NavigationThrottle, which are run earlier.

This patch moves the computation immediately after receiving the
response.

Since computing sandbox flags will depends on
is_loaded_from_mhtml_archive_ in:
https://chromium-review.googlesource.com/c/chromium/src/+/2452475
both are moved.

Bug: 1136873,1041376
Change-Id: I98d33ea0a9367e87571644da648d40d0487a97cf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2467917Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Reviewed-by: Łukasz Anforowicz <lukasza@chromium.org>
Commit-Queue: Arthur Sonzogni <arthursonzogni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818848}