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This change updates the prefixes used for loading Chromium specific
resources to use the aliases used by the Apache HTTP server for the http
bluetooth test. As a result, the cross origin iframe test now uses the
new test API so that it can be migrated to the wpt/ directory.

BUG=509038

Change-Id: Ib946c912913d7a67b887fff4d74e432ea915ddb9
Reviewed-on: https://chromium-review.googlesource.com/827531Reviewed-by: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Conley Owens <cco3@chromium.org>
Commit-Queue: Ovidio Henriquez <odejesush@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524521}