Fixes #519

This is the Symbol bug which is breaking package:unittest.

[email protected]

Review URL: https://codereview.chromium.org/1915533004 .

Author: vsmenon

pkg/dev_compiler/lib/src/compiler/code_generator.dart

@@ -3430,11 +3430,11 @@ class CodeGenerator extends GeneralizingAstVisitor
 
   @override
   visitSymbolLiteral(SymbolLiteral node) {
-    JS.New emitSymbol() {
+    JS.Expression emitSymbol() {
       // TODO(vsm): When we canonicalize, we need to treat private symbols
       // correctly.
       var name = js.string(node.components.join('.'), "'");
-      return new JS.New(_emitTypeName(types.symbolType), [name]);
+      return js.call('#.new(#)', [_emitTypeName(types.symbolType), name]);
     }
     return _emitConst(emitSymbol);
   }

pkg/dev_compiler/test/browser/language_tests.js

@@ -280,7 +280,6 @@
       'switch_label2_test',
       'switch_label_test',
       'switch_try_catch_test',
-      'symbol_literal_test_none_multi',
       'sync_generator1_test_none_multi',
       'throwing_lazy_variable_test',
       'top_level_non_prefixed_library_test',