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This introduces additional interception step into DevTools network
interception logic -- we now pause and report intercepted requests
after browser decided to follow the redirect, but before the request
is sent.

Change-Id: I228e6898d3a28abf80b8b6cc72ff61fac3884279
Reviewed-on: https://chromium-review.googlesource.com/1145946
Commit-Queue: Andrey Kosyakov <caseq@chromium.org>
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577212}