Remove all harmony runtime flags which shipped in M51

test/fuzzer/regexp.cc

 // Copyright 2016 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 <limits.h>
 #include <stddef.h>
 #include <stdint.h>
 
 #include "include/v8.h"
 #include "src/factory.h"
@@ skipping 12 matching lines @@
 
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
   v8_fuzzer::FuzzerSupport* support = v8_fuzzer::FuzzerSupport::Get();
   v8::Isolate* isolate = support->GetIsolate();
 
   v8::Isolate::Scope isolate_scope(isolate);
   v8::HandleScope handle_scope(isolate);
   v8::Context::Scope context_scope(support->GetContext());
   v8::TryCatch try_catch(isolate);
 
-  i::FLAG_harmony_unicode_regexps = true;
   i::FLAG_harmony_regexp_lookbehind = true;
 
   i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
   i::Factory* factory = i_isolate->factory();
 
   if (size > INT_MAX) return 0;
   i::MaybeHandle<i::String> maybe_source = factory->NewStringFromOneByte(
       i::Vector<const uint8_t>(data, static_cast<int>(size)));
   i::Handle<i::String> source;
   if (!maybe_source.ToHandle(&source)) return 0;
@@ skipping 24 matching lines @@
     Test(isolate, regexp, one_byte, results_array);
     Test(isolate, regexp, two_byte, results_array);
     Test(isolate, regexp, factory->empty_string(), results_array);
     Test(isolate, regexp, source, results_array);
   }
 
   isolate->RequestGarbageCollectionForTesting(
       v8::Isolate::kFullGarbageCollection);
   return 0;
 }