Refactor ChangeLowering class to avoid template specialization.

test/compiler-unittests/common-operator-unittest.h

Index: test/compiler-unittests/common-operator-unittest.h
diff --git a/test/compiler-unittests/common-operator-unittest.h b/test/compiler-unittests/common-operator-unittest.h
new file mode 100644
index 0000000000000000000000000000000000000000..9cfeb8742fa7702353a35165cf43e02cca8ecd3d
--- /dev/null
+++ b/test/compiler-unittests/common-operator-unittest.h
@@ -0,0 +1,31 @@
+// 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_COMPILER_UNITTESTS_COMMON_OPERATOR_UNITTEST_H_
+#define V8_COMPILER_UNITTESTS_COMMON_OPERATOR_UNITTEST_H_
+
+#include "src/compiler/common-operator.h"
+#include "test/compiler-unittests/compiler-unittests.h"
+
+namespace v8 {
+namespace internal {
+namespace compiler {
+
+class CommonOperatorTest : public CompilerTest {
+ public:
+  CommonOperatorTest();
+  virtual ~CommonOperatorTest();
+
+ protected:
+  CommonOperatorBuilder* common() { return &common_; }
+
+ private:
+  CommonOperatorBuilder common_;
+};
+
+}  // namespace compiler
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_COMPILER_UNITTESTS_COMMON_OPERATOR_UNITTEST_H_