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

src/prettyprinter.h

Index: src/prettyprinter.h
diff --git a/src/prettyprinter.h b/src/prettyprinter.h
index d1943bcc790fef226f26de5ccf4755ed05c894af..a05b61796a75ccee1b598b407e60861c92c4f6fa 100644
--- a/src/prettyprinter.h
+++ b/src/prettyprinter.h
@@ -25,7 +25,7 @@ class CallPrinter : public AstVisitor {
   void Find(AstNode* node, bool print = false);
 
 // Individual nodes
-#define DECLARE_VISIT(type) void Visit##type(type* node) OVERRIDE;
+#define DECLARE_VISIT(type) void Visit##type(type* node) override;
   AST_NODE_LIST(DECLARE_VISIT)
 #undef DECLARE_VISIT
 
@@ -67,7 +67,7 @@ class PrettyPrinter: public AstVisitor {
   static void PrintOut(Isolate* isolate, Zone* zone, AstNode* node);
 
   // Individual nodes
-#define DECLARE_VISIT(type) void Visit##type(type* node) OVERRIDE;
+#define DECLARE_VISIT(type) void Visit##type(type* node) override;
   AST_NODE_LIST(DECLARE_VISIT)
 #undef DECLARE_VISIT