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This CL adds an AbstractUrlTest test suite that covers both KURL and
GURL.  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: I6812c0230cc1ef91416aa9a8f967a5db15d4bf77
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2622736Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Tom Sepez <tsepez@chromium.org>
Auto-Submit: Łukasz Anforowicz <lukasza@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842560}