Cannot use Handle<T>::cast in Unique<T>::cast since it will try to do a T::cast (and its typecheck)…

src/lookup.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/v8.h"
 
 #include "src/bootstrapper.h"
 #include "src/deoptimizer.h"
 #include "src/lookup.h"
 #include "src/lookup-inl.h"
@@ skipping 294 matching lines @@
       holder_map_->instance_descriptors()->GetFieldType(descriptor_number()),
       isolate_);
 }
 
 
 Handle<PropertyCell> LookupIterator::GetPropertyCell() const {
   Handle<JSObject> holder = GetHolder<JSObject>();
   Handle<GlobalObject> global = Handle<GlobalObject>::cast(holder);
   Object* value = global->property_dictionary()->ValueAt(dictionary_entry());
   DCHECK(value->IsPropertyCell());
-  return Handle<PropertyCell>(PropertyCell::cast(value));
+  return handle(PropertyCell::cast(value));
 }
 
 
 Handle<Object> LookupIterator::GetAccessors() const {
   DCHECK_EQ(ACCESSOR, state_);
   return FetchValue();
 }
 
 
 Handle<Object> LookupIterator::GetDataValue() const {
@@ skipping 60 matching lines @@
       // Fall through.
       case InterceptorState::kSkipNonMasking:
         return true;
       case InterceptorState::kProcessNonMasking:
         return false;
     }
   }
   return interceptor_state_ == InterceptorState::kProcessNonMasking;
 }
 } }  // namespace v8::internal