fixes #215, removes special case for length

lib/src/codegen/js_codegen.dart

Index: lib/src/codegen/js_codegen.dart
diff --git a/lib/src/codegen/js_codegen.dart b/lib/src/codegen/js_codegen.dart
index 62a5a01109d3206ec36ea4a3325e510a5eeeb64c..d82e26a75f8fdab8e90e8b4c0b2f0cadc6d170e2 100644
--- a/lib/src/codegen/js_codegen.dart
+++ b/lib/src/codegen/js_codegen.dart
@@ -2670,8 +2670,7 @@ class JSCodegenVisitor extends GeneralizingAstVisitor {
 
     // Dart "extension" methods. Used for JS Array, Boolean, Number, String.
     if (allowExtensions && _extensionTypes.contains(type.element)) {
-      // Special case `length`. We can call it directly.
-      if (name != 'length') return js.call('dartx.#', _propertyName(name));
+      return js.call('dartx.#', _propertyName(name));

[vsm, 2015/06/10 17:00:46]

Will this really fix the broken text example?

There, I'm seeing this:

core.print(dart.dload(exports.l, 'length'));

[Jennifer Messerly, 2015/06/10 17:13:16]

yup. It works because of this logic:
https://github.com/dart-lang/dev_compiler/blob/master/lib/runtime/dart_runtim...

for dynamic dispatch to a Dart type or a Dart "extension type", we hide all JS
methods, that's why it's not finding "length", but it will find [dartx.length]

     }
 
     return _propertyName(name);