Revert "Expose v8::Function::GetDisplayName to public API."

src/api.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 4092 matching lines @@
 }
 
 
 Handle<Value> Function::GetInferredName() const {
   i::Handle<i::JSFunction> func = Utils::OpenHandle(this);
   return Utils::ToLocal(i::Handle<i::Object>(func->shared()->inferred_name(),
                                              func->GetIsolate()));
 }
 
 
-Handle<Value> Function::GetDisplayName() const {
-  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
-  ON_BAILOUT(isolate, "v8::Function::GetDisplayName()",
-             return ToApiHandle<Primitive>(
-                isolate->factory()->undefined_value()));
-  ENTER_V8(isolate);
-  i::HandleScope scope(isolate);
-  i::Handle<i::JSFunction> func = Utils::OpenHandle(this);
-  i::Handle<i::String> property_name =
-      isolate->factory()->InternalizeOneByteString(
-          STATIC_ASCII_VECTOR("displayName"));
-  i::LookupResult lookup(isolate);
-  func->LookupRealNamedProperty(*property_name, &lookup);
-  if (lookup.IsFound()) {
-    i::Object* value = lookup.GetLazyValue();
-    if (value && value->IsString()) {
-      i::String* name = i::String::cast(value);
-      if (name->length() > 0) return Utils::ToLocal(i::Handle<i::String>(name));
-    }
-  }
-  return ToApiHandle<Primitive>(isolate->factory()->undefined_value());
-}
-
-
 ScriptOrigin Function::GetScriptOrigin() const {
   i::Handle<i::JSFunction> func = Utils::OpenHandle(this);
   if (func->shared()->script()->IsScript()) {
     i::Handle<i::Script> script(i::Script::cast(func->shared()->script()));
     i::Handle<i::Object> scriptName = GetScriptNameOrSourceURL(script);
     v8::ScriptOrigin origin(
       Utils::ToLocal(scriptName),
       v8::Integer::New(script->line_offset()->value()),
       v8::Integer::New(script->column_offset()->value()));
     return origin;
@@ skipping 3426 matching lines @@
   Isolate* isolate = reinterpret_cast<Isolate*>(info.GetIsolate());
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 } }  // namespace v8::internal