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goBack requires waitForPageToFinishLoading, so that is converted also.
The wait is moved from app-side to test-side using a GREYCondition.

Uses http://crrev.com/c/1578949 as a guideline.

Bug: 922813
Change-Id: I4e4616f5f9bc7857e89e28df01171d3167e396c3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1610548
Commit-Queue: ericale <ericale@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#661096}