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This includes adding a new member to RenderFrameHostImpl to store the
latest http status code.

Bug: 990812
Change-Id: I83e61b328df4e37194cc3e1b17952986dd48cf1e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1742152
Commit-Queue: Mohamed Abdelhalim <zetamoo@chromium.org>
Reviewed-by: Arthur Sonzogni <arthursonzogni@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Reviewed-by: Lowell Manners <lowell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#686402}