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As part of the EG2 migration, app-side helpers that used to GREYAssert now
return NSError*, which are asserted on in test-side code. ASSERT_IF_ERROR
simplifies the modification required for test code that call these app-side
helpers, while preserving the line number of the failure.

This CL aligns the test code in these 4 CLs to use ASSERT_IF_ERROR:
http://crrev.com/c/1562756
http://crrev.com/c/1553085
http://crrev.com/c/1558155
http://crrev.com/c/1559889

Bug: 922813
Change-Id: I2d82dd9cd6a9eab6913418d357649c1f13f3699f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1574954
Commit-Queue: ericale <ericale@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#652855}