Fix the bots (TBR)

Review-Url: https://codereview.chromium.org/2986813002 .
diff --git a/pkg/analysis_server/test/analysis_abstract.dart b/pkg/analysis_server/test/analysis_abstract.dart
index c37be8f..796a9aa 100644
--- a/pkg/analysis_server/test/analysis_abstract.dart
+++ b/pkg/analysis_server/test/analysis_abstract.dart
@@ -329,6 +329,12 @@
   }
 
   @override
+  List<String> pathsFor(String pluginPath) {
+    fail('Unexpected invocation of pathsFor');
+    return null;
+  }
+
+  @override
   List<PluginInfo> pluginsForContextRoot(analyzer.ContextRoot contextRoot) {
     fail('Unexpected invocation of pluginsForContextRoot');
     return null;