dart2js: Fix hints in code base.

pkg/compiler/lib/src/resolution/type_resolver.dart

Index: pkg/compiler/lib/src/resolution/type_resolver.dart
diff --git a/pkg/compiler/lib/src/resolution/type_resolver.dart b/pkg/compiler/lib/src/resolution/type_resolver.dart
index 85c21712785ba763339089eff4f8a7a2573fc606..2d7e51f586a3cf1dfaceb0b8c703fdcd0a8a0430 100644
--- a/pkg/compiler/lib/src/resolution/type_resolver.dart
+++ b/pkg/compiler/lib/src/resolution/type_resolver.dart
@@ -15,7 +15,6 @@ class TypeResolver {
                           Scope scope,
                           {bool deferredIsMalformed: true}) {
     Element element;
-    bool deferredTypeAnnotation = false;
     if (prefixName != null) {
       Element prefixElement =
           lookupInScope(compiler, prefixName, scope, prefixName.source);
@@ -40,7 +39,6 @@ class TypeResolver {
         element = null;
       }
     } else {
-      String stringValue = typeName.source;
       element = lookupInScope(compiler, typeName, scope, typeName.source);
     }
     return element;
@@ -178,8 +176,6 @@ class TypeResolver {
       } else if (element.isTypeVariable) {
         Element outer =
             visitor.enclosingElement.outermostEnclosingMemberOrTopLevel;
-        bool isInFactoryConstructor =
-            outer != null && outer.isFactoryConstructor;
         if (!outer.isClass &&
             !outer.isTypedef &&
             !Elements.hasAccessToTypeVariables(visitor.enclosingElement)) {