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

base/compiler_specific.h

Index: base/compiler_specific.h
diff --git a/base/compiler_specific.h b/base/compiler_specific.h
index 09b4e7033269c7e9279c37b9c267a5560e7ca06c..fa9983143172855fab2b718f31bfdda77168f8a4 100644
--- a/base/compiler_specific.h
+++ b/base/compiler_specific.h
@@ -154,11 +154,11 @@
 // 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.