- Move length getter and setter interceptors to the new interceptor scheme.

sdk/lib/_internal/compiler/implementation/lib/js_array.dart

Index: sdk/lib/_internal/compiler/implementation/lib/js_array.dart
===================================================================
--- sdk/lib/_internal/compiler/implementation/lib/js_array.dart	(revision 15149)
+++ sdk/lib/_internal/compiler/implementation/lib/js_array.dart	(working copy)
@@ -168,4 +168,13 @@
   int get hashCode => Primitives.objectHashCode(receiver);
 
   Type get runtimeType => createRuntimeType('List');
+
+  int get length => JS('int', r'#.length', this);
+  
+  void set length(int newLength) {
+    if (newLength is !int) throw new ArgumentError(newLength);
+    if (newLength < 0) throw new RangeError.value(newLength);
+    checkGrowable(this, 'set length');
+    JS('void', r'#.length = #', this, newLength);
+  }
 }