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The HTTP result enum is not needed by the HTTP client, but the HTTP
result enum requires knowledge of the HTTP error enum. So, it is
necessary to move the HTTP error enum out of the "client" directory,
and house all HTTP enums in the "common" directory.

Change-Id: I5458d892f85b4045d2407954d16ef66f447139e8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2333871
Commit-Queue: Josh Nohle <nohle@chromium.org>
Auto-Submit: Josh Nohle <nohle@chromium.org>
Reviewed-by: James Vecore <vecore@google.com>
Cr-Commit-Position: refs/heads/master@{#795242}