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

src/compiler/source-position.h

Index: src/compiler/source-position.h
diff --git a/src/compiler/source-position.h b/src/compiler/source-position.h
index 985f035a2f9f682a243ba3f0faa76b14641e8a5e..68c4b4eadf30dbc1fa937ba2e9b0a25de44b7456 100644
--- a/src/compiler/source-position.h
+++ b/src/compiler/source-position.h
@@ -14,7 +14,7 @@ namespace compiler {
 
 // Encapsulates encoding and decoding of sources positions from which Nodes
 // originated.
-class SourcePosition FINAL {
+class SourcePosition final {
  public:
   explicit SourcePosition(int raw = kUnknownPosition) : raw_(raw) {}
 
@@ -43,7 +43,7 @@ inline bool operator!=(const SourcePosition& lhs, const SourcePosition& rhs) {
 }
 
 
-class SourcePositionTable FINAL {
+class SourcePositionTable final {
  public:
   class Scope {
    public: