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BookmarkEarlGrey contains the required methods that are being
re-implemented in the Signin codebase. To ensure consistency across
the codebase remove sign-in versions and update tests.

Bug: 1103274
Change-Id: I2a9348945def367512240279731e7e9b6839960f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2290633Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Nohemi Fernandez <fernandex@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791502}