Revert "Add optional message to assert in Dart2js - continued"

pkg/compiler/lib/src/tree/unparser.dart

Index: pkg/compiler/lib/src/tree/unparser.dart
diff --git a/pkg/compiler/lib/src/tree/unparser.dart b/pkg/compiler/lib/src/tree/unparser.dart
index 6f141fdf88eb4fec07ebf6111637976ece88190f..a0156be47b4ff3e5288c818fe8f4328f533b0bb9 100644
--- a/pkg/compiler/lib/src/tree/unparser.dart
+++ b/pkg/compiler/lib/src/tree/unparser.dart
@@ -58,18 +58,6 @@ class Unparser extends Indentation implements Visitor {
     if (node != null) node.accept(this);
   }
 
-  visitAssert(Assert node) {
-    write(node.assertToken.value);
-    write('(');
-    visit(node.condition);
-    if (node.hasMessage) {
-      write(',');
-      space();
-      visit(node.message);
-    }
-    write(');');
-  }
-
   visitBlock(Block node) => unparseBlockStatements(node.statements);
 
   unparseBlockStatements(NodeList statements) {