Replace OVERRIDE->override and FINAL->final since we now require C++11.

src/hydrogen-types.h

Index: src/hydrogen-types.h
diff --git a/src/hydrogen-types.h b/src/hydrogen-types.h
index 773a18ca7e12a416d7b28fb3f40f73bbd865d558..fe13345f76aa412174660ae3c13e6cec8671a33b 100644
--- a/src/hydrogen-types.h
+++ b/src/hydrogen-types.h
@@ -35,7 +35,7 @@ class Object;
   V(JSArray, 0xe21)       /* 0000 1110 0010 0001 */ \
   V(None, 0xfff)          /* 0000 1111 1111 1111 */
 
-class HType FINAL {
+class HType final {
  public:
   #define DECLARE_CONSTRUCTOR(Name, mask) \
     static HType Name() WARN_UNUSED_RESULT { return HType(k##Name); }