Revert "Initial import of unittests using GTest/GMock."

test/unittests/test-zone.h

-// Copyright 2014 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.
-
-#ifndef V8_UNITTESTS_TEST_ZONE_H_
-#define V8_UNITTESTS_TEST_ZONE_H_
-
-#include "src/zone.h"
-#include "test/unittests/test-isolate.h"
-
-namespace v8 {
-namespace internal {
-
-class ZoneTest : public virtual IsolateTest {
- public:
-  ZoneTest() : zone_(i_isolate()) {}
-  virtual ~ZoneTest() {}
-
-  Isolate* isolate() const { return i_isolate(); }
-  Zone* zone() { return &zone_; }
-
- private:
-  Zone zone_;
-};
-
-}  // namespace internal
-}  // namespace v8
-
-#endif  // V8_UNITTESTS_TEST_ZONE_H_