Remove all harmony runtime flags which shipped in M51

src/js/runtime.js

 // Copyright 2006-2008 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.
 
 // This files contains runtime support implemented in JavaScript.
 
 // CAUTION: Some of the functions specified in this file are called
 // directly from compiled code. These are the functions with names in
 // ALL CAPS. The compiled code passes the first argument in 'this'.
 
 
 // The following declarations are shared with other native JS files.
 // They are all declared at this one spot to avoid redeclaration errors.
 
 (function(global, utils) {
 
 %CheckIsBootstrapping();
 
-var FLAG_harmony_species;
 var GlobalArray = global.Array;
 var GlobalBoolean = global.Boolean;
 var GlobalString = global.String;
 var MakeRangeError;
 var MakeTypeError;
 var speciesSymbol;
 
 utils.Import(function(from) {
   MakeRangeError = from.MakeRangeError;
   MakeTypeError = from.MakeTypeError;
   speciesSymbol = from.species_symbol;
 });
 
-utils.ImportFromExperimental(function(from) {
-  FLAG_harmony_species = from.FLAG_harmony_species;
-});
-
 // ----------------------------------------------------------------------------
 
 
 /* ---------------------------------
    - - -   U t i l i t i e s   - - -
    ---------------------------------
 */
 
 
 function ToPositiveInteger(x, rangeErrorIndex) {
@@ skipping 11 matching lines @@
 function MinSimple(a, b) {
   return a > b ? b : a;
 }
 
 
 %SetForceInlineFlag(MaxSimple);
 %SetForceInlineFlag(MinSimple);
 
 
 // ES2015 7.3.20
-// For the fallback with --harmony-species off, there are two possible choices:
-//  - "conservative": return defaultConstructor
-//  - "not conservative": return object.constructor
-// This fallback path is only needed in the transition to ES2015, and the
-// choice is made simply to preserve the previous behavior so that we don't
-// have a three-step upgrade: old behavior, unspecified intermediate behavior,
-// and ES2015.
-// In some cases, we were "conservative" (e.g., ArrayBuffer, RegExp), and in
-// other cases we were "not conservative (e.g., TypedArray, Promise).
-function SpeciesConstructor(object, defaultConstructor, conservative) {
-  if (FLAG_harmony_species) {
-    var constructor = object.constructor;
-    if (IS_UNDEFINED(constructor)) {
-      return defaultConstructor;
-    }
-    if (!IS_RECEIVER(constructor)) {
-      throw MakeTypeError(kConstructorNotReceiver);
-    }
-    var species = constructor[speciesSymbol];
-    if (IS_NULL_OR_UNDEFINED(species)) {
-      return defaultConstructor;
-    }
-    if (%IsConstructor(species)) {
-      return species;
-    }
-    throw MakeTypeError(kSpeciesNotConstructor);
-  } else {
-    return conservative ? defaultConstructor : object.constructor;
+function SpeciesConstructor(object, defaultConstructor) {
+  var constructor = object.constructor;
+  if (IS_UNDEFINED(constructor)) {
+    return defaultConstructor;
   }
+  if (!IS_RECEIVER(constructor)) {
+    throw MakeTypeError(kConstructorNotReceiver);
+  }
+  var species = constructor[speciesSymbol];
+  if (IS_NULL_OR_UNDEFINED(species)) {
+    return defaultConstructor;
+  }
+  if (%IsConstructor(species)) {
+    return species;
+  }
+  throw MakeTypeError(kSpeciesNotConstructor);
 }
 
 //----------------------------------------------------------------------------
 
 // NOTE: Setting the prototype for Array must take place as early as
 // possible due to code generation for array literals.  When
 // generating code for a array literal a boilerplate array is created
 // that is cloned when running the code.  It is essential that the
 // boilerplate gets the right prototype.
 %FunctionSetPrototype(GlobalArray, new GlobalArray(0));
 
 // ----------------------------------------------------------------------------
 // Exports
 
 utils.Export(function(to) {
   to.MaxSimple = MaxSimple;
   to.MinSimple = MinSimple;
   to.ToPositiveInteger = ToPositiveInteger;
   to.SpeciesConstructor = SpeciesConstructor;
 });
 
 })