Replace @ReflectiveTestCase() with @reflectiveTest.

pkg/analysis_server/test/services/index/store/collection_test.dart

Index: pkg/analysis_server/test/services/index/store/collection_test.dart
diff --git a/pkg/analysis_server/test/services/index/store/collection_test.dart b/pkg/analysis_server/test/services/index/store/collection_test.dart
index e8ce7183f2ce643067a2872736080a6d0dcf463c..f27214db189b36ac8a563c410e7917be898deb85 100644
--- a/pkg/analysis_server/test/services/index/store/collection_test.dart
+++ b/pkg/analysis_server/test/services/index/store/collection_test.dart
@@ -17,7 +17,7 @@ main() {
 }
 
 
-@ReflectiveTestCase()
+@reflectiveTest
 class _IntArrayToIntMapTest {
   IntArrayToIntMap map = new IntArrayToIntMap();
 
@@ -31,7 +31,7 @@ class _IntArrayToIntMapTest {
 }
 
 
-@ReflectiveTestCase()
+@reflectiveTest
 class _IntToIntSetMapTest {
   IntToIntSetMap map = new IntToIntSetMap();