Implement 'analysis.occurrences' for the new analysis driver.

pkg/analysis_server/test/integration/analysis/occurrences_test.dart

Index: pkg/analysis_server/test/integration/analysis/occurrences_test.dart
diff --git a/pkg/analysis_server/test/integration/analysis/occurrences_test.dart b/pkg/analysis_server/test/integration/analysis/occurrences_test.dart
index 69bd7e6c57d14367852c795b2068ff8d058d5c13..88fe2094e4730d4959a4584d2dcaa451437852b3 100644
--- a/pkg/analysis_server/test/integration/analysis/occurrences_test.dart
+++ b/pkg/analysis_server/test/integration/analysis/occurrences_test.dart
@@ -73,10 +73,4 @@ class OccurrencesTest extends AbstractOccurrencesTest {}
 class OccurrencesTest_Driver extends AbstractOccurrencesTest {
   @override
   bool get enableNewAnalysisDriver => true;
-
-  @failingTest
-  test_occurrences() {
-    //  NoSuchMethodError: The getter 'iterator' was called on null.
-    return super.test_occurrences();
-  }
 }