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This patch updates the Chromium side of the Blink platform changes,
removing method variants we no longer use, and converting the whole
thing to work on hostnames rather than WebURL/WebSecurityOrigin.

Patch 1 - Blink:    https://codereview.chromium.org/845303003
Patch 2 - Chromium: [THIS PATCH]

BUG=378566
R=jochen@chromium.org

Review URL: https://codereview.chromium.org/852573002

Cr-Commit-Position: refs/heads/master@{#311471}