dart2js: Fix hints in code base.

pkg/compiler/lib/src/js_emitter/program_builder.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library dart2js.js_emitter.program_builder;
 
 import 'js_emitter.dart' show computeMixinClass;
 import 'model.dart';
 
 import '../common.dart';
@@ skipping 10 matching lines @@
     InterceptorStubGenerator,
     MainCallStubGenerator,
     ParameterStubGenerator,
     RuntimeTypeGenerator,
     TypeTestProperties;
 
 import '../elements/elements.dart' show ParameterElement, MethodElement;
 
 import '../universe/universe.dart' show Universe;
 import '../deferred_load.dart' show DeferredLoadTask, OutputUnit;
-import '../constants/expressions.dart' show ConstantExpression, ConstantValue;
 
 part 'registry.dart';
 
 class ProgramBuilder {
   final Compiler _compiler;
   final Namer namer;
   final CodeEmitterTask _task;
 
   final Registry _registry;
 
@@ skipping 445 matching lines @@
 
     // TODO(kasperl): Figure out under which conditions code is null.
     if (code == null) return null;
 
     bool canTearOff = false;
     String tearOffName;
     bool isClosure = false;
     bool isNotApplyTarget = !element.isFunction || element.isAccessor;
 
     bool canBeReflected = _methodCanBeReflected(element);
-    bool needsStubs = _methodNeedsStubs(element);
     bool canBeApplied = _methodCanBeApplied(element);
 
     String aliasName = backend.isAliasedSuperMember(element)
         ? namer.aliasedSuperMemberPropertyName(element)
         : null;
 
     if (isNotApplyTarget) {
       canTearOff = false;
     } else {
       if (element.enclosingClass.isClosure) {
@@ skipping 247 matching lines @@
       _registry.registerConstant(outputUnit, constantValue);
       assert(!_constants.containsKey(constantValue));
       String name = namer.constantName(constantValue);
       String constantObject = namer.globalObjectForConstant(constantValue);
       Holder holder = _registry.registerHolder(constantObject);
       Constant constant = new Constant(name, holder, constantValue);
       _constants[constantValue] = constant;
     }
   }
 }