Refactor ChangeLowering class to avoid template specialization.

test/compiler-unittests/compiler-unittests.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_COMPILER_UNITTESTS_COMPILER_UNITTESTS_H_
 #define V8_COMPILER_UNITTESTS_COMPILER_UNITTESTS_H_
 
 #include "include/v8.h"
 #include "src/zone.h"
 #include "testing/gtest-support.h"
@@ skipping 30 matching lines @@
 #else
 #define TARGET_TYPED_TEST(Case, Name) TYPED_TEST(Case, DISABLED_##Name)
 #endif
 
 
 class CompilerTest : public ::testing::Test {
  public:
   CompilerTest();
   virtual ~CompilerTest();
 
+  Factory* factory() const;
   Isolate* isolate() const { return reinterpret_cast<Isolate*>(isolate_); }
   Zone* zone() { return &zone_; }
 
   static void SetUpTestCase();
   static void TearDownTestCase();
 
  private:
   static v8::Isolate* isolate_;
   v8::Isolate::Scope isolate_scope_;
   v8::HandleScope handle_scope_;
   v8::Context::Scope context_scope_;
   Zone zone_;
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_UNITTESTS_COMPILER_UNITTESTS_H_