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- Adds verifyFolderExists to BookmarkEarlGrey and its AppInterface.

- Adds ScrollToTop to ChromeActions to be used on Bookmark Folder test.

- Deletes BookmarkEarlGreyUtils since its no longer used.

Change-Id: Ia1eeb07bcfa80f03e263c49d4f89b2592c338903
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1976490
Commit-Queue: Sergio Collazos <sczs@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#726604}