Fix recently introduced strong-mode errors

pkg/analyzer/test/src/task/dart_test.dart

Index: pkg/analyzer/test/src/task/dart_test.dart
diff --git a/pkg/analyzer/test/src/task/dart_test.dart b/pkg/analyzer/test/src/task/dart_test.dart
index 951ee79779aa39a329cbe8480c6ca1ed8d8653bf..c51e55e47c60338e2a77fc914c877ef01c1f8a39 100644
--- a/pkg/analyzer/test/src/task/dart_test.dart
+++ b/pkg/analyzer/test/src/task/dart_test.dart
@@ -181,7 +181,8 @@ f() {
     Annotation annotation = unit.declarations
         .firstWhere((m) => m is FunctionDeclaration)
         .metadata[0];
-    List<ConstantEvaluationTarget> expectedConstants = [
+    List<ConstantEvaluationTarget> expectedConstants =

[Jennifer Messerly, 2016/09/15 21:00:33]

maybe "var" on left side so the type isn't repeated? and would fit on one line
:)

[Brian Wilkerson, 2016/09/15 21:37:26]

I would, but there is a sharp pain in the back of my head every time I type that
three letter replacement for a type. :-)

+        <ConstantEvaluationTarget>[
       unitElement.accessors.firstWhere((e) => e.isGetter).variable,
       unitElement.types[0].fields[0],
       unitElement.functions[0].localVariables[0],