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

src/compiler/change-lowering.h

Index: src/compiler/change-lowering.h
diff --git a/src/compiler/change-lowering.h b/src/compiler/change-lowering.h
index 0d498ccd9760b10d8cfff279f20bacf169f6b4ce..ead41b1a004b67a8ec922d7a846b70e86213f006 100644
--- a/src/compiler/change-lowering.h
+++ b/src/compiler/change-lowering.h
@@ -18,12 +18,12 @@ class Linkage;
 class MachineOperatorBuilder;
 class Operator;
 
-class ChangeLowering FINAL : public Reducer {
+class ChangeLowering final : public Reducer {
  public:
   explicit ChangeLowering(JSGraph* jsgraph) : jsgraph_(jsgraph) {}
-  ~ChangeLowering() FINAL;
+  ~ChangeLowering() final;
 
-  Reduction Reduce(Node* node) FINAL;
+  Reduction Reduce(Node* node) final;
 
  private:
   Node* HeapNumberValueIndexConstant();