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We are minimizing the impact of class verification failures for UrlBar by
putting all the failures into their own subclass. Thus, only the subclass
will fail.

No-Presubmit: true
Bug: 999165
Change-Id: I12ea5e29cdfac7973dbec26b44a1f0b7adf21e3d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1803730
Commit-Queue: Sam Maier <smaier@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#698618}