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During the EG1 to EG2 migration a duplicate testing class was created to
help expose necessary class-specific methods to EarlGrey. Now that the
transition is complete we will remove the dependency to
SigninEarlGreyAppInterface helper class and only expose SigninEarlGrey
to client code.

This patch also uses the more canonical 'verify' prefix for EarlGrey
assertions.

Bug: 1103274
Change-Id: I7cf71df0826068e79c8e0006744907fe36c70be5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2352931
Commit-Queue: Nohemi Fernandez <fernandex@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797636}