[wrapper-tracing] Remove flag and object grouping entry points

third_party/WebKit/Source/bindings/core/v8/TraceWrapperV8Reference.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef TraceWrapperV8Reference_h
 #define TraceWrapperV8Reference_h
 
 #include "bindings/core/v8/ScriptWrappableVisitor.h"
 
 namespace blink {
@@ skipping 38 matching lines @@
   ALWAYS_INLINE v8::Local<T> newLocal(v8::Isolate* isolate) const {
     return v8::Local<T>::New(isolate, m_handle);
   }
 
   bool isEmpty() const { return m_handle.IsEmpty(); }
   void clear() { m_handle.Reset(); }
   ALWAYS_INLINE v8::Persistent<T>& get() { return m_handle; }
 
   void setReference(const v8::Persistent<v8::Object>& parent,
                     v8::Isolate* isolate) {
-    DCHECK(!RuntimeEnabledFeatures::traceWrappablesEnabled());
     isolate->SetReference(parent, m_handle);
   }
 
   template <typename S>
   const TraceWrapperV8Reference<S>& cast() const {
     return reinterpret_cast<const TraceWrapperV8Reference<S>&>(
         const_cast<const TraceWrapperV8Reference<T>&>(*this));
   }
 
  private:
   inline void internalSet(v8::Isolate* isolate, v8::Local<T> handle) {
     m_handle.Reset(isolate, handle);
     ScriptWrappableVisitor::writeBarrier(m_parent, &cast<v8::Value>());
   }
 
   v8::Persistent<T> m_handle;
   void* m_parent;
 };
 
 }  // namespace blink
 
 #endif  // TraceWrapperV8Reference_h