[intrinsic] Drop the %_ValueOf intrinsic.

src/js/symbol.js

Index: src/js/symbol.js
diff --git a/src/js/symbol.js b/src/js/symbol.js
index 2e7cc53d008c0572b0a2dfec3ae092d1be6dbae5..86af489601385b68d3f19490efedb06910f2b337 100644
--- a/src/js/symbol.js
+++ b/src/js/symbol.js
@@ -32,34 +32,6 @@ utils.Import(function(from) {
 
 // -------------------------------------------------------------------
 
-// 19.4.3.4 Symbol.prototype [ @@toPrimitive ] ( hint )
-function SymbolToPrimitive(hint) {
-  if (!(IS_SYMBOL(this) || IS_SYMBOL_WRAPPER(this))) {
-    throw MakeTypeError(kIncompatibleMethodReceiver,
-                        "Symbol.prototype [ @@toPrimitive ]", this);
-  }
-  return %_ValueOf(this);
-}
-
-
-function SymbolToString() {
-  if (!(IS_SYMBOL(this) || IS_SYMBOL_WRAPPER(this))) {
-    throw MakeTypeError(kIncompatibleMethodReceiver,
-                        "Symbol.prototype.toString", this);
-  }
-  return %SymbolDescriptiveString(%_ValueOf(this));
-}
-
-
-function SymbolValueOf() {
-  if (!(IS_SYMBOL(this) || IS_SYMBOL_WRAPPER(this))) {
-    throw MakeTypeError(kIncompatibleMethodReceiver,
-                        "Symbol.prototype.valueOf", this);
-  }
-  return %_ValueOf(this);
-}
-
-
 function SymbolFor(key) {
   key = TO_STRING(key);
   var registry = %SymbolRegistry();
@@ -98,23 +70,4 @@ utils.InstallFunctions(GlobalSymbol, DONT_ENUM, [
   "keyFor", SymbolKeyFor
 ]);
 
-%AddNamedProperty(
-    GlobalSymbol.prototype, toStringTagSymbol, "Symbol", DONT_ENUM | READ_ONLY);
-
-utils.InstallFunctions(GlobalSymbol.prototype, DONT_ENUM | READ_ONLY, [
-  toPrimitiveSymbol, SymbolToPrimitive
-]);
-
-utils.InstallFunctions(GlobalSymbol.prototype, DONT_ENUM, [
-  "toString", SymbolToString,
-  "valueOf", SymbolValueOf
-]);
-
-// -------------------------------------------------------------------
-// Exports
-
-utils.Export(function(to) {
-  to.SymbolToString = SymbolToString;
-})
-
 })