Remove uses of VisitDOMWrapper

third_party/WebKit/Source/bindings/core/v8/custom/V8MutationObserverCustom.cpp

Index: third_party/WebKit/Source/bindings/core/v8/custom/V8MutationObserverCustom.cpp
diff --git a/third_party/WebKit/Source/bindings/core/v8/custom/V8MutationObserverCustom.cpp b/third_party/WebKit/Source/bindings/core/v8/custom/V8MutationObserverCustom.cpp
index 479d7113d19ea11db333c49b15538dc80ef9f29e..5c4aea890149d7a1f26b7771ce83ebb7da1c2b86 100644
--- a/third_party/WebKit/Source/bindings/core/v8/custom/V8MutationObserverCustom.cpp
+++ b/third_party/WebKit/Source/bindings/core/v8/custom/V8MutationObserverCustom.cpp
@@ -70,18 +70,4 @@ void V8MutationObserver::constructorCustom(
                        info.GetIsolate(), observer, &wrapperTypeInfo, wrapper));
 }
 
-void V8MutationObserver::visitDOMWrapperCustom(
-    v8::Isolate* isolate,
-    ScriptWrappable* scriptWrappable,
-    const v8::Persistent<v8::Object>& wrapper) {
-  MutationObserver* observer = scriptWrappable->toImpl<MutationObserver>();
-  HeapHashSet<Member<Node>> observedNodes = observer->getObservedNodes();
-  for (HeapHashSet<Member<Node>>::iterator it = observedNodes.begin();
-       it != observedNodes.end(); ++it) {
-    v8::UniqueId id(reinterpret_cast<intptr_t>(
-        V8GCController::opaqueRootForGC(isolate, *it)));
-    isolate->SetReferenceFromGroup(id, wrapper);
-  }
-}
-
 }  // namespace blink