Revert of [turbofan] Make Factory::NewNumber() always return the minus_zero_value.

test/unittests/factory-unittest.cc

Index: test/unittests/factory-unittest.cc
diff --git a/test/unittests/factory-unittest.cc b/test/unittests/factory-unittest.cc
deleted file mode 100644
index 472f364651757e7e39d985ad472ee74043bbf740..0000000000000000000000000000000000000000
--- a/test/unittests/factory-unittest.cc
+++ /dev/null
@@ -1,21 +0,0 @@
-// Copyright 2015 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/factory.h"
-#include "src/handles-inl.h"
-#include "test/unittests/test-utils.h"
-
-namespace v8 {
-namespace internal {
-
-typedef TestWithIsolate FactoryTest;
-
-
-TEST_F(FactoryTest, NewNumberWithMinusZero) {
-  Handle<Object> minus_zero_value = factory()->minus_zero_value();
-  EXPECT_TRUE(minus_zero_value.is_identical_to(factory()->NewNumber(-0.0)));
-}
-
-}  // namespace internal
-}  // namespace v8