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Reporting and Document Policy are going to be using SH, and it is more generally
useful as a building block for new features than just Web Packages. This CL
moves it into blink/[public/]common/http, and removes the http_ prefix from
individual files and directories.

Bug: 993790, 1011101
Change-Id: I344e4aad6ebeb6956e441a7ab75478d98d7f60a8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1835998Reviewed-by: Kunihiko Sakamoto <ksakamoto@chromium.org>
Reviewed-by: Jeremy Roman <jbroman@chromium.org>
Commit-Queue: Ian Clelland <iclelland@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702877}