Remove all harmony runtime flags which shipped in M51

src/js/collection.js

Index: src/js/collection.js
diff --git a/src/js/collection.js b/src/js/collection.js
index 0d7195d53e26757a68b5bdb3dcba34bea38857c2..bbb7ed247bb5d851b4e96d5b1f64e87ea412f9c9 100644
--- a/src/js/collection.js
+++ b/src/js/collection.js
@@ -19,6 +19,7 @@ var MakeTypeError;
 var MapIterator;
 var NumberIsNaN;
 var SetIterator;
+var speciesSymbol = utils.ImportNow("species_symbol");
 var toStringTagSymbol = utils.ImportNow("to_string_tag_symbol");
 
 utils.Import(function(from) {
@@ -255,6 +256,12 @@ function SetForEach(f, receiver) {
   }
 }
 
+
+function SetSpecies() {
+  return this;
+}
+
+
 // -------------------------------------------------------------------
 
 %SetCode(GlobalSet, SetConstructor);
@@ -266,6 +273,8 @@ function SetForEach(f, receiver) {
 
 %FunctionSetLength(SetForEach, 1);
 
+utils.InstallGetter(GlobalSet, speciesSymbol, SetSpecies);
+
 // Set up the non-enumerable functions on the Set prototype object.
 utils.InstallGetter(GlobalSet.prototype, "size", SetGetSize);
 utils.InstallFunctions(GlobalSet.prototype, DONT_ENUM, [
@@ -435,6 +444,11 @@ function MapForEach(f, receiver) {
   }
 }
 
+
+function MapSpecies() {
+  return this;
+}
+
 // -------------------------------------------------------------------
 
 %SetCode(GlobalMap, MapConstructor);
@@ -446,6 +460,8 @@ function MapForEach(f, receiver) {
 
 %FunctionSetLength(MapForEach, 1);
 
+utils.InstallGetter(GlobalMap, speciesSymbol, MapSpecies);
+
 // Set up the non-enumerable functions on the Map prototype object.
 utils.InstallGetter(GlobalMap.prototype, "size", MapGetSize);
 utils.InstallFunctions(GlobalMap.prototype, DONT_ENUM, [