Remove ActiveDOMCallback

third_party/WebKit/Source/bindings/core/v8/V8MutationCallback.cpp

Index: third_party/WebKit/Source/bindings/core/v8/V8MutationCallback.cpp
diff --git a/third_party/WebKit/Source/bindings/core/v8/V8MutationCallback.cpp b/third_party/WebKit/Source/bindings/core/v8/V8MutationCallback.cpp
index 2e37dfe5255e0af8f771904463a02532871be020..a9b62b56ea8de7200b588d5560816130fd4b7ca6 100644
--- a/third_party/WebKit/Source/bindings/core/v8/V8MutationCallback.cpp
+++ b/third_party/WebKit/Source/bindings/core/v8/V8MutationCallback.cpp
@@ -39,9 +39,7 @@ namespace blink {
 V8MutationCallback::V8MutationCallback(v8::Local<v8::Function> callback,
                                        v8::Local<v8::Object> owner,
                                        ScriptState* scriptState)
-    : ActiveDOMCallback(scriptState->getExecutionContext()),
-      m_callback(scriptState->isolate(), callback),
-      m_scriptState(scriptState) {
+    : m_callback(scriptState->isolate(), callback), m_scriptState(scriptState) {
   V8PrivateProperty::getMutationObserverCallback(scriptState->isolate())
       .set(scriptState->context(), owner, callback);
   m_callback.setPhantom();
@@ -52,11 +50,11 @@ V8MutationCallback::~V8MutationCallback() {}
 void V8MutationCallback::call(
     const HeapVector<Member<MutationRecord>>& mutations,
     MutationObserver* observer) {
-  if (!canInvokeCallback())
-    return;
-
   v8::Isolate* isolate = m_scriptState->isolate();
-
+  ExecutionContext* executionContext = m_scriptState->getExecutionContext();
+  if (!executionContext || executionContext->isContextSuspended() ||
+      executionContext->isContextDestroyed())
+    return;
   if (!m_scriptState->contextIsValid())
     return;
   ScriptState::Scope scope(m_scriptState.get());
@@ -85,7 +83,6 @@ void V8MutationCallback::call(
 
 DEFINE_TRACE(V8MutationCallback) {
   MutationCallback::trace(visitor);
-  ActiveDOMCallback::trace(visitor);
 }
 
 }  // namespace blink