[builtins] Drop useless ToBoolean JavaScript builtin.

src/v8natives.js

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 (function(global, utils) {
 
 %CheckIsBootstrapping();
 
 // ----------------------------------------------------------------------------
 // Imports
 
 var FLAG_harmony_tostring;
 var GlobalArray = global.Array;
 var GlobalBoolean = global.Boolean;
 var GlobalFunction = global.Function;
 var GlobalNumber = global.Number;
 var GlobalObject = global.Object;
 var InternalArray = utils.InternalArray;
 var iteratorSymbol = utils.ImportNow("iterator_symbol");
 var MathAbs;
 var ProxyDelegateCallAndConstruct;
 var ProxyDerivedHasOwnTrap;
 var ProxyDerivedKeysTrap;
 var StringIndexOf;
-var ToBoolean = utils.ImportNow("ToBoolean");
 var toStringTagSymbol = utils.ImportNow("to_string_tag_symbol");
 
 utils.Import(function(from) {
   MathAbs = from.MathAbs;
   StringIndexOf = from.StringIndexOf;
 });
 
 utils.ImportFromExperimental(function(from) {
   FLAG_harmony_tostring = from.FLAG_harmony_tostring;
   ProxyDelegateCallAndConstruct = from.ProxyDelegateCallAndConstruct;
@@ skipping 305 matching lines @@
 }
 
 
 // ES5 8.10.5.
 function ToPropertyDescriptor(obj) {
   if (!IS_SPEC_OBJECT(obj)) throw MakeTypeError(kPropertyDescObject, obj);
 
   var desc = new PropertyDescriptor();
 
   if ("enumerable" in obj) {
-    desc.setEnumerable(ToBoolean(obj.enumerable));
+    desc.setEnumerable(TO_BOOLEAN(obj.enumerable));
   }
 
   if ("configurable" in obj) {
-    desc.setConfigurable(ToBoolean(obj.configurable));
+    desc.setConfigurable(TO_BOOLEAN(obj.configurable));
   }
 
   if ("value" in obj) {
     desc.setValue(obj.value);
   }
 
   if ("writable" in obj) {
-    desc.setWritable(ToBoolean(obj.writable));
+    desc.setWritable(TO_BOOLEAN(obj.writable));
   }
 
   if ("get" in obj) {
     var get = obj.get;
     if (!IS_UNDEFINED(get) && !IS_CALLABLE(get)) {
       throw MakeTypeError(kObjectGetterCallable, get);
     }
     desc.setGet(get);
   }
 
@@ skipping 233 matching lines @@
 }
 
 
 // Harmony proxies.
 function DefineProxyProperty(obj, p, attributes, should_throw) {
   // TODO(rossberg): adjust once there is a story for symbols vs proxies.
   if (IS_SYMBOL(p)) return false;
 
   var handler = %GetHandler(obj);
   var result = CallTrap2(handler, "defineProperty", UNDEFINED, p, attributes);
-  if (!ToBoolean(result)) {
+  if (!result) {
     if (should_throw) {
       throw MakeTypeError(kProxyHandlerReturned,
                           handler, "false", "defineProperty");
     } else {
       return false;
     }
   }
   return true;
 }
 
@@ skipping 737 matching lines @@
 ]);
 
 
 // ----------------------------------------------------------------------------
 // Boolean
 
 function BooleanConstructor(x) {
   // TODO(bmeurer): Move this to toplevel.
   "use strict";
   if (%_IsConstructCall()) {
-    %_SetValueOf(this, ToBoolean(x));
+    %_SetValueOf(this, TO_BOOLEAN(x));
   } else {
-    return ToBoolean(x);
+    return TO_BOOLEAN(x);
   }
 }
 
 
 function BooleanToString() {
   // NOTE: Both Boolean objects and values can enter here as
   // 'this'. This is not as dictated by ECMA-262.
   var b = this;
   if (!IS_BOOLEAN(b)) {
     if (!IS_BOOLEAN_WRAPPER(b)) {
@@ skipping 454 matching lines @@
 %InstallToContext([
   "global_eval_fun", GlobalEval,
   "object_value_of", ObjectValueOf,
   "object_to_string", ObjectToString,
   "object_define_own_property", DefineOwnPropertyFromAPI,
   "object_get_own_property_descriptor", ObjectGetOwnPropertyDescriptor,
   "to_complete_property_descriptor", ToCompletePropertyDescriptor,
 ]);
 
 })