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The DRP session key may not be available from the request headers. If it
isn't, get it from the UI thread instead.

Bug: 952523
Change-Id: I82befab8a97b5c463db37b0d5e82edc640d9af18
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1576154Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Commit-Queue: Robert Ogden <robertogden@chromium.org>
Cr-Commit-Position: refs/heads/master@{#652858}