Add test for removing static method.

dart/pkg/dart2js_incremental/lib/library_updater.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_incremental.library_updater;
 
 import 'dart:async' show
     Future;
 
 import 'dart:convert' show
@@ skipping 215 matching lines @@
       return canReuseRemovedFunction(element);
     }
     return cannotReuse(
         element, "Removed element that isn't a method.");
   }
 
   bool canReuseRemovedFunction(PartialFunctionElement element) {
     logVerbose("Removed method $element.");
 
     PartialClassElement cls = element.enclosingClass;
-    if (cls != null && !element.isInstanceMember) {
-      return cannotReuse(element, "Removed static method");
-    }
     for (ScopeContainerElement scope in scopesAffectedBy(element, cls)) {
       scanSites(scope, (Element member, DeclarationSite site) {
         // TODO(ahe): Cache qualifiedNamesIn to avoid quadratic behavior.
         Map<String, List<String>> names = qualifiedNamesIn(site);
         if (canNamesResolveTo(names, element, cls)) {
           _elementsToInvalidate.add(member);
         }
       });
     }
 
@@ skipping 433 matching lines @@
 
 abstract class JsFeatures {
   Compiler get compiler;
 
   JavaScriptBackend get backend => compiler.backend;
 
   Namer get namer => backend.namer;
 
   CodeEmitterTask get emitter => backend.emitter;
 }