Remove unused IsDirty

src/api.cc

 // Copyright 2012 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/api.h"
 
 #include <string.h>  // For memcpy, strlen.
 #ifdef V8_USE_ADDRESS_SANITIZER
 #include <sanitizer/asan_interface.h>
 #endif  // V8_USE_ADDRESS_SANITIZER
@@ skipping 3756 matching lines @@
   // When turning on access checks for a global object deoptimize all functions
   // as optimized code does not always handle access checks.
   i::Deoptimizer::DeoptimizeGlobalObject(*obj);
 
   i::Handle<i::Map> new_map = i::Map::Copy(i::Handle<i::Map>(obj->map()));
   new_map->set_is_access_check_needed(true);
   i::JSObject::MigrateToMap(obj, new_map);
 }
 
 
-bool v8::Object::IsDirty() {
-  return Utils::OpenHandle(this)->IsDirty();
-}
-
-
 Local<v8::Object> v8::Object::Clone() {
   i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   ON_BAILOUT(isolate, "v8::Object::Clone()", return Local<Object>());
   ENTER_V8(isolate);
   i::Handle<i::JSObject> self = Utils::OpenHandle(this);
   EXCEPTION_PREAMBLE(isolate);
   i::Handle<i::JSObject> result = isolate->factory()->CopyJSObject(self);
   has_pending_exception = result.is_null();
   EXCEPTION_BAILOUT_CHECK(isolate, Local<Object>());
   return Utils::ToLocal(result);
@@ skipping 3920 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