Remove all harmony runtime flags which shipped in M51

src/isolate.cc

 // 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.
 
 #include "src/isolate.h"
 
 #include <stdlib.h>
 
 #include <fstream>  // NOLINT(readability/streams)
 #include <sstream>
@@ skipping 2639 matching lines @@
 
 void Isolate::InvalidateIsConcatSpreadableProtector() {
   DCHECK(factory()->is_concat_spreadable_protector()->value()->IsSmi());
   DCHECK(IsIsConcatSpreadableLookupChainIntact());
   factory()->is_concat_spreadable_protector()->set_value(
       Smi::FromInt(kArrayProtectorInvalid));
   DCHECK(!IsIsConcatSpreadableLookupChainIntact());
 }
 
 void Isolate::InvalidateArraySpeciesProtector() {
-  if (!FLAG_harmony_species) return;
   DCHECK(factory()->species_protector()->value()->IsSmi());
   DCHECK(IsArraySpeciesLookupChainIntact());
   factory()->species_protector()->set_value(
       Smi::FromInt(kArrayProtectorInvalid));
   DCHECK(!IsArraySpeciesLookupChainIntact());
 }
 
 bool Isolate::IsAnyInitialArrayPrototype(Handle<JSArray> array) {
   DisallowHeapAllocation no_gc;
   return IsInAnyContext(*array, Context::INITIAL_ARRAY_PROTOTYPE_INDEX);
@@ skipping 387 matching lines @@
   // Then check whether this scope intercepts.
   if ((flag & intercept_mask_)) {
     intercepted_flags_ |= flag;
     return true;
   }
   return false;
 }
 
 }  // namespace internal
 }  // namespace v8