All strong mode cleaning of dart2js.

tests/compiler/dart2js/resolver_test.dart

Index: tests/compiler/dart2js/resolver_test.dart
diff --git a/tests/compiler/dart2js/resolver_test.dart b/tests/compiler/dart2js/resolver_test.dart
index f16e481f1d19d2467dd8be290a240febe4ee0fdb..9bbfe8eed2ddeecb8a63fbf376a5333df0f4cde1 100644
--- a/tests/compiler/dart2js/resolver_test.dart
+++ b/tests/compiler/dart2js/resolver_test.dart
@@ -134,8 +134,6 @@ class Foo extends X<Foo> {}
 class Bar extends Foo implements X<Bar> {}
 """);
       compiler.resolveStatement("Bar bar;");
-      LibraryElement mainApp = compiler.mainApp;
-      ClassElement classBar = mainApp.find("Bar");
       DiagnosticCollector collector = compiler.diagnosticCollector;
       Expect.equals(0, collector.warnings.length);
       Expect.equals(1, collector.errors.length);
@@ -289,7 +287,6 @@ Future testThis() {
           (funElement as FunctionElementX).parseNode(compiler.parsingContext);
       visitor.visit(function.body);
       Map mapping = map(visitor);
-      List<Element> values = mapping.values.toList();
       DiagnosticCollector collector = compiler.diagnosticCollector;
       Expect.equals(0, mapping.length);
       Expect.equals(0, collector.warnings.length);
@@ -628,11 +625,6 @@ Future testOneInterface() {
     // correctly.
     compiler.parseScript("abstract class Bar {}");
 
-    ResolverVisitor visitor = new ResolverVisitor(
-        compiler.resolution,
-        null,
-        new ResolutionRegistry(
-            compiler.backend.target, new CollectingTreeElements(null)));
     compiler.resolveStatement("Foo bar;");
 
     LibraryElement mainApp = compiler.mainApp;