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

src/preparser.h

Index: src/preparser.h
diff --git a/src/preparser.h b/src/preparser.h
index 0440d831eea5105552c2c268534faead9ff44f0e..33c737f8633e970cb3c63ea85a0efb3b5cc65be9 100644
--- a/src/preparser.h
+++ b/src/preparser.h
@@ -644,7 +644,7 @@ class ParserBase : public Traits {
         : ObjectLiteralCheckerBase(parser), has_seen_proto_(false) {}
 
     void CheckProperty(Token::Value property, PropertyKind type, bool is_static,
-                       bool is_generator, bool* ok) OVERRIDE;
+                       bool is_generator, bool* ok) override;
 
    private:
     bool IsProto() { return this->scanner()->LiteralMatches("__proto__", 9); }
@@ -659,7 +659,7 @@ class ParserBase : public Traits {
         : ObjectLiteralCheckerBase(parser), has_seen_constructor_(false) {}
 
     void CheckProperty(Token::Value property, PropertyKind type, bool is_static,
-                       bool is_generator, bool* ok) OVERRIDE;
+                       bool is_generator, bool* ok) override;
 
    private:
     bool IsConstructor() {