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As documented in //components/README.md, code in components must not
depend on higher-level layers of the Chromium codebase, including
//ios/chrome.

Move ukm_url_recorder.* and tests from ios/chrome/browser/metrics to
components/ukm/ios (to parallel the version in content that is found
in components/ukm/content).

Fix UkmUrlRecorderTest to use WebTestWithWebState instead of the
unavailable (due to layering violation) ChromeWebTest.

Bug: 754895
Change-Id: I829486037063f16fe5fca5b7617017c0530a1859
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1878649
Auto-Submit: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710273}