Revert of [runtime] Introduce dedicated JSBoundFunction to represent bound functions.

src/runtime/runtime-observe.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/runtime/runtime-utils.h"
 
 #include "src/arguments.h"
 #include "src/debug/debug.h"
 #include "src/isolate-inl.h"
 
@@ skipping 38 matching lines @@
   HandleScope scope(isolate);
   DCHECK(args.length() == 0);
   isolate->RunMicrotasks();
   return isolate->heap()->undefined_value();
 }
 
 
 RUNTIME_FUNCTION(Runtime_DeliverObservationChangeRecords) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 2);
-  CONVERT_ARG_HANDLE_CHECKED(JSReceiver, callback, 0);
+  CONVERT_ARG_HANDLE_CHECKED(JSFunction, callback, 0);
   CONVERT_ARG_HANDLE_CHECKED(Object, argument, 1);
   v8::TryCatch catcher(reinterpret_cast<v8::Isolate*>(isolate));
   // We should send a message on uncaught exception thrown during
   // Object.observe delivery while not interrupting further delivery, thus
   // we make a call inside a verbose TryCatch.
   catcher.SetVerbose(true);
   Handle<Object> argv[] = {argument};
 
   // If we are in step-in mode, flood the handler.
   isolate->debug()->EnableStepIn();
@@ skipping 19 matching lines @@
 
 static bool ContextsHaveSameOrigin(Handle<Context> context1,
                                    Handle<Context> context2) {
   return context1->security_token() == context2->security_token();
 }
 
 
 RUNTIME_FUNCTION(Runtime_ObserverObjectAndRecordHaveSameOrigin) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 3);
-  CONVERT_ARG_HANDLE_CHECKED(JSReceiver, observer, 0);
+  CONVERT_ARG_HANDLE_CHECKED(JSFunction, observer, 0);
   CONVERT_ARG_HANDLE_CHECKED(JSObject, object, 1);
   CONVERT_ARG_HANDLE_CHECKED(JSObject, record, 2);
 
-  while (observer->IsJSBoundFunction()) {
-    observer = handle(
-        Handle<JSBoundFunction>::cast(observer)->bound_target_function());
-  }
-  if (!observer->IsJSFunction()) return isolate->heap()->false_value();
-
-  Handle<Context> observer_context(
-      Handle<JSFunction>::cast(observer)->context()->native_context());
+  Handle<Context> observer_context(observer->context()->native_context());
   Handle<Context> object_context(object->GetCreationContext());
   Handle<Context> record_context(record->GetCreationContext());
 
   return isolate->heap()->ToBoolean(
       ContextsHaveSameOrigin(object_context, observer_context) &&
       ContextsHaveSameOrigin(object_context, record_context));
 }
 
 
 RUNTIME_FUNCTION(Runtime_ObjectWasCreatedInCurrentOrigin) {
@@ skipping 30 matching lines @@
 RUNTIME_FUNCTION(Runtime_GetObjectContextNotifierPerformChange) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 1);
   CONVERT_ARG_HANDLE_CHECKED(JSObject, object_info, 0);
 
   Handle<Context> context(object_info->GetCreationContext(), isolate);
   return context->native_object_notifier_perform_change();
 }
 }  // namespace internal
 }  // namespace v8