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This adds additional EG test coverage for Safe Browsing, for
scenarios identified by the test team when they were
manually testing this feature.

Change-Id: Id27ff75a0e92ba7501aeb250ab0112d8eb9a278b
Bug: 1093510
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2246995
Commit-Queue: Ali Juma <ajuma@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#780509}