[runtime] [proxy] removing JSFunctionProxy and related code.

src/factory.h

Index: src/factory.h
diff --git a/src/factory.h b/src/factory.h
index da4417a88b61a2ffaf95901861b4937e45ed1fbe..789b3d42fda0fc20add39fee97d12470c79e1967 100644
--- a/src/factory.h
+++ b/src/factory.h
@@ -479,13 +479,6 @@ class Factory final {
   Handle<JSProxy> NewJSProxy(Handle<JSReceiver> target,
                              Handle<JSReceiver> handler);
 
-  // Allocates a Harmony function proxy.
-  Handle<JSProxy> NewJSFunctionProxy(Handle<JSReceiver> target,
-                                     Handle<JSReceiver> handler,
-                                     Handle<JSReceiver> call_trap,
-                                     Handle<Object> construct_trap,
-                                     Handle<Object> prototype);
-
   // Reinitialize an JSGlobalProxy based on a constructor.  The object
   // must have the same size as objects allocated using the
   // constructor.  The object is reinitialized and behaves as an