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

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instead of _TEST_CASE_, so this CL cleans up some of the outdated usage.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.

R=hidehiko@chromium.org

Bug: 925652
Change-Id: I0f9f03c8e34187cf5d84d5076726fd469e8605e0
Reviewed-on: https://chromium-review.googlesource.com/c/1438367
Commit-Queue: Hidehiko Abe <hidehiko@chromium.org>
Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#626463}

components/arc/arc_session_impl_unittest.cc

@@ -632,9 +632,9 @@ TEST_P(ArcSessionImplPackagesCacheModeTest, PackagesCacheModes) {
                                                     .packages_cache_mode());
 }
 
-INSTANTIATE_TEST_CASE_P(,
-                        ArcSessionImplPackagesCacheModeTest,
-                        ::testing::ValuesIn(kPackagesCacheModeStates));
+INSTANTIATE_TEST_SUITE_P(,
+                         ArcSessionImplPackagesCacheModeTest,
+                         ::testing::ValuesIn(kPackagesCacheModeStates));
 
 TEST_F(ArcSessionImplTest, DemoSession) {
   auto arc_session = CreateArcSession();