Revert of Restore per-TypedArray-class length accessors as a perf workaround

test/mjsunit/es6/typedarray-proto.js

Index: test/mjsunit/es6/typedarray-proto.js
diff --git a/test/mjsunit/es6/typedarray-proto.js b/test/mjsunit/es6/typedarray-proto.js
index 346b2ea63ddabb233a3cd3e0b13fa5d2ee95105f..0bd90d13b404ca7befbac7817c8e688addf51f39 100644
--- a/test/mjsunit/es6/typedarray-proto.js
+++ b/test/mjsunit/es6/typedarray-proto.js
@@ -28,17 +28,13 @@
 let classProperties = new Set([
   "length", "name", "arguments", "caller", "prototype", "BYTES_PER_ELEMENT"
 ]);
-let instanceProperties = new Set([
-  "BYTES_PER_ELEMENT", "constructor", "prototype",
-  // length is also an instance property as a temporary workaround to
-  // BUG(chromium:579905). TODO(littledan): remove the workaround
-  "length"
-]);
+let instanceProperties = new Set(["BYTES_PER_ELEMENT", "constructor", "prototype"]);
 
 function functionProperties(object) {
   return Object.getOwnPropertyNames(object).filter(function(name) {
     return typeof Object.getOwnPropertyDescriptor(object, name).value
-        == "function" && name != 'constructor';
+        == "function"
+      && name != 'constructor' && name != 'subarray';
   });
 }