Reland Migrate Object.prototype.valueOf to CSA

src/js/v8natives.js

Index: src/js/v8natives.js
diff --git a/src/js/v8natives.js b/src/js/v8natives.js
index 9a827f3f020b4080ed5151d44e43c6be4f61be99..60a78d0ca986d52be9628a1b6a54880d3ddc7017 100644
--- a/src/js/v8natives.js
+++ b/src/js/v8natives.js
@@ -30,12 +30,6 @@ function ObjectToLocaleString() {
 }
 
 
-// ES6 19.1.3.7 Object.prototype.valueOf()
-function ObjectValueOf() {
-  return TO_OBJECT(this);
-}
-
-
 // ES6 19.1.3.3 Object.prototype.isPrototypeOf(V)
 function ObjectIsPrototypeOf(V) {
   if (!IS_RECEIVER(V)) return false;
@@ -75,7 +69,7 @@ function ObjectConstructor(x) {
 utils.InstallFunctions(GlobalObject.prototype, DONT_ENUM, [
   "toString", ObjectToString,
   "toLocaleString", ObjectToLocaleString,
-  "valueOf", ObjectValueOf,
+  // valueOf is added in bootstrapper.cc.
   "isPrototypeOf", ObjectIsPrototypeOf,
   // propertyIsEnumerable is added in bootstrapper.cc.
   // __defineGetter__ is added in bootstrapper.cc.
@@ -112,8 +106,4 @@ utils.Export(function(to) {
   to.ObjectHasOwnProperty = GlobalObject.prototype.hasOwnProperty;
 });
 
-%InstallToContext([
-  "object_value_of", ObjectValueOf,
-]);
-
 })