Replace FINAL and OVERRIDE with their C++11 counterparts in Source/modules/serviceworkers

Source/modules/serviceworkers/Headers.h

Index: Source/modules/serviceworkers/Headers.h
diff --git a/Source/modules/serviceworkers/Headers.h b/Source/modules/serviceworkers/Headers.h
index 1fd9f1a1332da31e69be988fe166ceacbfe95431..5205b0f9ec5fd167938c913885564ddb1fd27c31 100644
--- a/Source/modules/serviceworkers/Headers.h
+++ b/Source/modules/serviceworkers/Headers.h
@@ -19,7 +19,7 @@ class Iterator;
 class ScriptValue;
 
 // http://fetch.spec.whatwg.org/#headers-class
-class Headers FINAL : public GarbageCollected<Headers>, public ScriptWrappable {
+class Headers final : public GarbageCollected<Headers>, public ScriptWrappable {
     DEFINE_WRAPPERTYPEINFO();
 public:
     enum Guard { ImmutableGuard, RequestGuard, RequestNoCORSGuard, ResponseGuard, NoneGuard };