[builtins] Migrate ArrayBufferPrototypeByteLength to C++.

src/js/arraybuffer.js

Index: src/js/arraybuffer.js
diff --git a/src/js/arraybuffer.js b/src/js/arraybuffer.js
index b602dcbf259f8d6625f80f66a551c6db3891a4f2..2e7d77e0a37a0acde123cf3d2a40456133421ccf 100644
--- a/src/js/arraybuffer.js
+++ b/src/js/arraybuffer.js
@@ -27,14 +27,6 @@ utils.Import(function(from) {
 
 // -------------------------------------------------------------------
 
-function ArrayBufferGetByteLen() {
-  if (!IS_ARRAYBUFFER(this)) {
-    throw MakeTypeError(kIncompatibleMethodReceiver,
-                        'ArrayBuffer.prototype.byteLength', this);
-  }
-  return %_ArrayBufferGetByteLength(this);
-}
-
 // ES6 Draft 15.13.5.5.3
 function ArrayBufferSlice(start, end) {
   if (!IS_ARRAYBUFFER(this)) {
@@ -92,9 +84,6 @@ function ArrayBufferSpecies() {
 
 utils.InstallGetter(GlobalArrayBuffer, speciesSymbol, ArrayBufferSpecies);
 
-utils.InstallGetter(GlobalArrayBuffer.prototype, "byteLength",
-                    ArrayBufferGetByteLen);
-
 utils.InstallFunctions(GlobalArrayBuffer.prototype, DONT_ENUM, [
   "slice", ArrayBufferSlice
 ]);