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We should keep the
NetworkService.URLLoader.RequestInitiatorOriginLockCompatibility
histogram until we are ready to start terminating renderers which submit
a request_initiator that is incompatible with
request_initiator_site_lock.

Bug: 967471
Change-Id: I7a6df884257aaeea15bf39cced24e8393e27e07a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1632556Reviewed-by: Charlie Reis <creis@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Ilya Sherman <isherman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#664619}