test: Replace _TEST_CASE_ with _TEST_SUITE_ in /chrome/browser/extensions/api/platform_keys.

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instead of _TEST_CASE_, so this CL cleans up some of the outdated usage.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=emaxx@chromium.org

Bug: 925652
Change-Id: I1f3436a182d6047e8b2989835df355c1a14880c6
Reviewed-on: https://chromium-review.googlesource.com/c/1437342
Commit-Queue: Maksim Ivanov <emaxx@chromium.org>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Cr-Commit-Position: refs/heads/master@{#626502}

chrome/browser/extensions/api/platform_keys/platform_keys_apitest_nss.cc

@@ -352,7 +352,7 @@ IN_PROC_BROWSER_TEST_P(UnmanagedPlatformKeysTest, Permissions) {
   ASSERT_TRUE(RunExtensionTest("permissionTests")) << message_;
 }
 
-INSTANTIATE_TEST_CASE_P(
+INSTANTIATE_TEST_SUITE_P(
     Unmanaged,
     UnmanagedPlatformKeysTest,
     ::testing::Values(UnmanagedPlatformKeysTestParams(
@@ -402,7 +402,7 @@ IN_PROC_BROWSER_TEST_P(ManagedWithoutPermissionPlatformKeysTest,
       << message_;
 }
 
-INSTANTIATE_TEST_CASE_P(
+INSTANTIATE_TEST_SUITE_P(
     ManagedWithoutPermission,
     ManagedWithoutPermissionPlatformKeysTest,
     ::testing::Values(
@@ -461,7 +461,7 @@ IN_PROC_BROWSER_TEST_P(ManagedWithPermissionPlatformKeysTest,
       << message_;
 }
 
-INSTANTIATE_TEST_CASE_P(
+INSTANTIATE_TEST_SUITE_P(
     ManagedWithPermission,
     ManagedWithPermissionPlatformKeysTest,
     ::testing::Values(