fixes #43, remove => workaround

lib/src/js/nodes.dart

Index: lib/src/js/nodes.dart
diff --git a/lib/src/js/nodes.dart b/lib/src/js/nodes.dart
index 34d1618b4d76e1159d12096344ea15e416dea486..2b62fea9c2399c2511a7fb4e4529dd1fb6b2a0e4 100644
--- a/lib/src/js/nodes.dart
+++ b/lib/src/js/nodes.dart
@@ -958,8 +958,6 @@ class ArrowFun extends FunctionExpression {
   final List<Identifier> params;
   final body; // Expression or Block
 
-  bool _bindThisWorkaround; // lazy initialized
-
   ArrowFun(this.params, this.body);
 
   accept(NodeVisitor visitor) => visitor.visitArrowFun(this);
@@ -971,29 +969,10 @@ class ArrowFun extends FunctionExpression {
 
   ArrowFun _clone() => new ArrowFun(params, body);
 
-  /// This is a workaround for V8 arrow function bindings being not yet
-  /// implemented. See <https://code.google.com/p/v8/issues/detail?id=2700>
-  bool get bindThisWorkaround {
-    if (_bindThisWorkaround != null) return _bindThisWorkaround;
-    var visitor = new _ThisFinder();
-    body.accept(visitor);
-    return _bindThisWorkaround = visitor.found;
-  }
-
   /// Ensure parens always get generated if necessary.
   // TODO(jmesserly): I'm not sure the printer is handling this correctly for
   // function() { ... } either.
-  int get precedenceLevel => bindThisWorkaround ? CALL : ASSIGNMENT;
-}
-
-class _ThisFinder extends BaseVisitor {
-  bool found = false;
-  visitThis(This node) {
-    found = true;
-  }
-  visitNode(Node node) {
-    if (!found) super.visitNode(node);
-  }
+  int get precedenceLevel => ASSIGNMENT;
 }
 
 class AsyncModifier {