Add test for removing static method.

dart/pkg/dart2js_incremental/lib/library_updater.dart

Index: dart/pkg/dart2js_incremental/lib/library_updater.dart
diff --git a/dart/pkg/dart2js_incremental/lib/library_updater.dart b/dart/pkg/dart2js_incremental/lib/library_updater.dart
index 25eb60b0c84a53cbbdfa9ab4b350b1ea902321aa..3582f726d211a4bf322678d41094e9da03a4f5c6 100644
--- a/dart/pkg/dart2js_incremental/lib/library_updater.dart
+++ b/dart/pkg/dart2js_incremental/lib/library_updater.dart
@@ -233,9 +233,6 @@ class LibraryUpdater extends JsFeatures {
     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.