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This CL adds a couple of hooks for the OSIntegrationManager to call
into the upcoming implementation of the ProtocolHandlerManager. There
should be no observable difference in behavior with this CL.

Bug: 1019239
Change-Id: I88455e0dd868d0b8944de231dd2cbf5f1a89516a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2577769
Commit-Queue: Fabio Rocha <fabio.rocha@microsoft.com>
Reviewed-by: Jan Krcal <jkrcal@chromium.org>
Reviewed-by: Daniel Murphy <dmurph@chromium.org>
Cr-Commit-Position: refs/heads/master@{#837773}