Add optional message to assert in Dart2js.

pkg/compiler/lib/src/universe/universe.dart

Index: pkg/compiler/lib/src/universe/universe.dart
diff --git a/pkg/compiler/lib/src/universe/universe.dart b/pkg/compiler/lib/src/universe/universe.dart
index 4530400e1cbaffc794effa09c6a3e22e636bd033..afdd48abbf517a6da1f65acd455c1593a918ef50 100644
--- a/pkg/compiler/lib/src/universe/universe.dart
+++ b/pkg/compiler/lib/src/universe/universe.dart
@@ -826,9 +826,6 @@ class Selector {
   bool get isOperator => kind == SelectorKind.OPERATOR;
   bool get isUnaryOperator => isOperator && argumentCount == 0;
 
-  /** Check whether this is a call to 'assert'. */
-  bool get isAssert => isCall && identical(name, "assert");
-
   /**
    * The member name for invocation mirrors created from this selector.
    */
@@ -882,8 +879,7 @@ class Selector {
   bool sameNameHack(Element element, World world) {
     // TODO(ngeoffray): Remove workaround checks.
     return element.isConstructor ||
-           name == element.name ||
-           name == 'assert' && world.isAssertMethod(element);
+           name == element.name;
   }
 
   bool applies(Element element, World world) {