Remove ContextLifecycleObserver from ActiveDOMCallback

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

Index: third_party/WebKit/Source/bindings/core/v8/ActiveDOMCallback.cpp
diff --git a/third_party/WebKit/Source/bindings/core/v8/ActiveDOMCallback.cpp b/third_party/WebKit/Source/bindings/core/v8/ActiveDOMCallback.cpp
index 6b80705bb8cab83dd27e12114eef41643a9af766..a9458246d169d99b64fbc26ac42d1d3c745aebd9 100644
--- a/third_party/WebKit/Source/bindings/core/v8/ActiveDOMCallback.cpp
+++ b/third_party/WebKit/Source/bindings/core/v8/ActiveDOMCallback.cpp
@@ -37,14 +37,17 @@
 namespace blink {
 
 ActiveDOMCallback::ActiveDOMCallback(ExecutionContext* context)
-    : ContextLifecycleObserver(context) {}
+    : m_context(context) {}
 
 ActiveDOMCallback::~ActiveDOMCallback() {}
 
 bool ActiveDOMCallback::canInvokeCallback() const {
-  ExecutionContext* context = getExecutionContext();
-  return context && !context->activeDOMObjectsAreSuspended() &&
-         !context->isContextDestroyed();
+  return !m_context->activeDOMObjectsAreSuspended() &&
+         !m_context->isContextDestroyed();
+}
+
+DEFINE_TRACE(ActiveDOMCallback) {
+  visitor->trace(m_context);
 }
 
 }  // namespace blink