Remove --harmony-regexps flag

test/cctest/test-regexp.cc

Index: test/cctest/test-regexp.cc
diff --git a/test/cctest/test-regexp.cc b/test/cctest/test-regexp.cc
index ddd1119204ca72c3b01ffc2a3f260d8a3ff767f6..b830483ce5d2a16300940ecd8f476467d60bd85b 100644
--- a/test/cctest/test-regexp.cc
+++ b/test/cctest/test-regexp.cc
@@ -1911,7 +1911,6 @@ void MockUseCounterCallback(v8::Isolate* isolate,
 // 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;