Remove --harmony-regexps flag

test/cctest/test-regexp.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1893 matching lines @@
 void MockUseCounterCallback(v8::Isolate* isolate,
                             v8::Isolate::UseCounterFeature feature) {
   ++global_use_counts[feature];
 }
 }
 
 
 // Test that ES2015 RegExp compatibility fixes are in place, that they
 // are not overly broad, and the appropriate UseCounters are incremented
 TEST(UseCountRegExp) {
-  i::FLAG_harmony_regexps = true;
   v8::Isolate* isolate = CcTest::isolate();
   v8::HandleScope scope(isolate);
   LocalContext env;
   int use_counts[v8::Isolate::kUseCounterFeatureCount] = {};
   global_use_counts = use_counts;
   CcTest::isolate()->SetUseCounterCallback(MockUseCounterCallback);
 
   // Compat fix: RegExp.prototype.sticky == undefined; UseCounter tracks it
   v8::Local<v8::Value> resultSticky = CompileRun("RegExp.prototype.sticky");
   CHECK_EQ(1, use_counts[v8::Isolate::kRegExpPrototypeStickyGetter]);
@@ skipping 42 matching lines @@
   // .toString() throws on non-RegExps that aren't RegExp.prototype
   v8::Local<v8::Value> resultToStringError = CompileRun(
       "var exception;"
       "try { RegExp.prototype.toString.call(null) }"
       "catch (e) { exception = e; }"
       "exception");
   CHECK_EQ(1, use_counts[v8::Isolate::kRegExpPrototypeStickyGetter]);
   CHECK_EQ(1, use_counts[v8::Isolate::kRegExpPrototypeToString]);
   CHECK(resultToStringError->IsObject());
 }