Remove obsolete DEBUG and NDEBUG macro dance.

src/v8.h

 // Copyright 2011 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_V8_H_
 #define V8_V8_H_
 
 #include "include/v8.h"
 #include "src/allocation.h"
 
-#if defined(GOOGLE3) || defined(DCHECK_ALWAYS_ON)
-// Google3 and Chromium special flag handling.
-#if defined(DEBUG) && defined(NDEBUG)
-// V8 only uses DEBUG and whenever it is set we are building a debug
-// version of V8. We do not use NDEBUG and simply undef it here for
-// consistency.
-#undef NDEBUG
-#endif
-#endif  // defined(GOOGLE3)
-
-// V8 only uses DEBUG, but included external files
-// may use NDEBUG - make sure they are consistent.
-#if defined(DEBUG) && defined(NDEBUG)
-#error both DEBUG and NDEBUG are set
-#endif
-
 namespace v8 {
 namespace internal {
 
 class V8 : public AllStatic {
  public:
   // Global actions.
 
   static bool Initialize();
   static void TearDown();
 
@@ skipping 13 matching lines @@
   static void InitializeOncePerProcessImpl();
   static void InitializeOncePerProcess();
 
   // v8::Platform to use.
   static v8::Platform* platform_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_V8_H_