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This CL adds a helper method for parsing the consent result returned
from Gaia via JavaScript. This method is used in GaiaRemoteConsentFlow
to check that the consent was actually granted by the user.

Bug: 1026237
Change-Id: I9d5b44f275d227316794dd06be69bf68878e24fa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2030948Reviewed-by: David Roger <droger@chromium.org>
Commit-Queue: Alex Ilin <alexilin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737301}