test: Replace _TEST_CASE_ with _TEST_SUITE_ in /components/autofill.

Googletest is (at last) converging with industry-standard terminology
[1]. We previously called test suites "test cases", which was rather
confusing for folks coming from any other testing framework.

Chrome now has a googltest version that supports _TEST_SUITE_ macros
instead of _TEST_CASE_, so this CL cleans up some of the outdated usage.

[1] https://github.com/google/googletest/blob/master/googletest/docs/primer.md#beware-of-the-nomenclature

This CL was uploaded by git cl split.


Bug: 925652
Change-Id: I70982ea2118322ffd5ea133a6790d9726069ce7b
Reviewed-on: https://chromium-review.googlesource.com/c/1438314
Reviewed-by: Roger McFarlane <rogerm@chromium.org>
Commit-Queue: Roger McFarlane <rogerm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#631373}
22 files changed