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

src/hydrogen-gvn.h

Index: src/hydrogen-gvn.h
diff --git a/src/hydrogen-gvn.h b/src/hydrogen-gvn.h
index 542bc8a52bc7f185353bb5489cbec5ed36ad5c57..fc7f27368e24b192750036d04897ce6d6c3befeb 100644
--- a/src/hydrogen-gvn.h
+++ b/src/hydrogen-gvn.h
@@ -18,7 +18,7 @@ namespace internal {
 // which can be used to represent side effects that cannot be expressed using
 // the GVNFlags of an HInstruction. These special side effects are tracked by a
 // SideEffectsTracker (see below).
-class SideEffects FINAL {
+class SideEffects final {
  public:
   static const int kNumberOfSpecials = 64 - kNumberOfFlags;
 
@@ -62,7 +62,7 @@ struct TrackedEffects;
 // SideEffects class (see above). This way unrelated global variable/inobject
 // field stores don't prevent hoisting and merging of global variable/inobject
 // field loads.
-class SideEffectsTracker FINAL BASE_EMBEDDED {
+class SideEffectsTracker final BASE_EMBEDDED {
  public:
   SideEffectsTracker() : num_global_vars_(0), num_inobject_fields_(0) {}
   SideEffects ComputeChanges(HInstruction* instr);
@@ -110,7 +110,7 @@ std::ostream& operator<<(std::ostream& os, const TrackedEffects& f);
 
 
 // Perform common subexpression elimination and loop-invariant code motion.
-class HGlobalValueNumberingPhase FINAL : public HPhase {
+class HGlobalValueNumberingPhase final : public HPhase {
  public:
   explicit HGlobalValueNumberingPhase(HGraph* graph);