compiler_specific.h: define FINAL as final when using Clang on Windows

base/compiler_specific.h

 // Copyright (c) 2012 The Chromium 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 BASE_COMPILER_SPECIFIC_H_
 #define BASE_COMPILER_SPECIFIC_H_
 
 #include "build/build_config.h"
 
 #if defined(COMPILER_MSVC)
@@ skipping 136 matching lines @@
 #define OVERRIDE override
 #else
 #define OVERRIDE
 #endif
 
 // Annotate a virtual method indicating that subclasses must not override it,
 // or annotate a class to indicate that it cannot be subclassed.
 // Use like:
 //   virtual void foo() FINAL;
 //   class B FINAL : public A {};
-#if defined(COMPILER_MSVC)
+#if defined(__clang__)
+#define FINAL final
+#elif defined(COMPILER_MSVC)
 // TODO(jered): Change this to "final" when chromium no longer uses MSVC 2010.
 #define FINAL sealed
-#elif defined(__clang__)
-#define FINAL final
 #elif defined(COMPILER_GCC) && __cplusplus >= 201103 && \
       (__GNUC__ * 10000 + __GNUC_MINOR__ * 100) >= 40700
 // GCC 4.7 supports explicit virtual overrides when C++11 support is enabled.
 #define FINAL final
 #else
 #define FINAL
 #endif
 
 // Annotate a function indicating the caller must examine the return value.
 // Use like:
@@ skipping 42 matching lines @@
 // Macro useful for writing cross-platform function pointers.
 #if !defined(CDECL)
 #if defined(OS_WIN)
 #define CDECL __cdecl
 #else  // defined(OS_WIN)
 #define CDECL
 #endif  // defined(OS_WIN)
 #endif  // !defined(CDECL)
 
 #endif  // BASE_COMPILER_SPECIFIC_H_