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Use DevToolsStatus enum to distinguish DevTools-handled redirects from request failures. Fix some typos.

Change-Id: If32f061c76f44fa830ec701ffbf01d88963d1b9c
Reviewed-on: https://chromium-review.googlesource.com/959587
Commit-Queue: Hidy Han <hidyhan@chromium.org>
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Reviewed-by: Alex Clarke <alexclarke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542912}