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

src/compiler/ast-graph-builder.h

Index: src/compiler/ast-graph-builder.h
diff --git a/src/compiler/ast-graph-builder.h b/src/compiler/ast-graph-builder.h
index 4e3a9e310eafe1d2b5260cba835b862f9a002c55..74728ddf8516c1c55a9e86e0b5b4cf736bcfb79b 100644
--- a/src/compiler/ast-graph-builder.h
+++ b/src/compiler/ast-graph-builder.h
@@ -47,13 +47,13 @@ class AstGraphBuilder : public AstVisitor {
   }
 
  protected:
-#define DECLARE_VISIT(type) void Visit##type(type* node) OVERRIDE;
+#define DECLARE_VISIT(type) void Visit##type(type* node) override;
   // Visiting functions for AST nodes make this an AstVisitor.
   AST_NODE_LIST(DECLARE_VISIT)
 #undef DECLARE_VISIT
 
   // Visiting function for declarations list is overridden.
-  void VisitDeclarations(ZoneList<Declaration*>* declarations) OVERRIDE;
+  void VisitDeclarations(ZoneList<Declaration*>* declarations) override;
 
  private:
   class AstContext;