Remove dead CompileOptimized() method from JSFunction.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 1ecacd8d16d72e03366651def33d20ff31d94649..f1fd3b9f13b2f04a279de5f1079cf0ce5f867af2 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -7384,9 +7384,6 @@ class JSFunction: public JSObject {
   void MarkForConcurrentOptimization();
   void MarkInOptimizationQueue();
 
-  static bool CompileOptimized(Handle<JSFunction> function,
-                               ClearExceptionFlag flag);
-
   // Tells whether or not the function is already marked for lazy
   // recompilation.
   inline bool IsMarkedForOptimization();