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This CL adds an AbstractOriginTest test suite that covers both
blink::SecurityOrigin and url::Origin.  Having tests that are shared
across Blink and //url will help 1) avoid code duplication and 2) ensure
that Blink and //url behave in the same way (at least wrt things covered
by the shared tests).

Bug: 1164416
Change-Id: I1a4ecb32eba4d31ca07328a43f4392586588aca5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2606715
Commit-Queue: Łukasz Anforowicz <lukasza@chromium.org>
Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841679}