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Issue was pointed out in crbug.com/1096617. We currently return the
frame's token as the portal token (and vice-versa) to the renderer
through the CreatePortal callback.

Change-Id: I66bfc503e1ff31462002212a4cfd093c7a83d0a0
Bug: 1096617
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2305832Reviewed-by: Lucas Gadani <lfg@chromium.org>
Reviewed-by: Charlie Reis <creis@chromium.org>
Commit-Queue: Adithya Srinivasan <adithyas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790582}