Add FINAL to base/compiler_specific.

base/compiler_specific.h

Index: base/compiler_specific.h
diff --git a/base/compiler_specific.h b/base/compiler_specific.h
index 0a6e05a6c67988b64b416b612d47ec41c457a78f..c61641219455c72db67c605feb9e8c2638727ea8 100644
--- a/base/compiler_specific.h
+++ b/base/compiler_specific.h
@@ -137,4 +137,15 @@
 // If available, it would look like:
 //   __attribute__((format(wprintf, format_param, dots_param)))
 
+// Annotate a class to indicate that it cannot be subclassed. Use this very
+// sparingly.  The only valid use case is if you have a class with virtual
+// methods but no virtual destructor -- see http://crbug.com/84424
+// Use like:
+//   class B FINAL : public A {};
+#if defined(__clang__)

[Mark Mentovai, 2011/05/31 14:41:05]

Should we have COMPILER_CLANG?

+#define FINAL final

[Mark Mentovai, 2011/05/31 14:41:05]

I’m surprised it’s final and not __final__ or an __attribute__.

+#else
+#define FINAL
+#endif
+
 #endif  // BASE_COMPILER_SPECIFIC_H_