Signal no pending activity in destructed contexts.

third_party/WebKit/Source/modules/battery/BatteryManager.cpp

Index: third_party/WebKit/Source/modules/battery/BatteryManager.cpp
diff --git a/third_party/WebKit/Source/modules/battery/BatteryManager.cpp b/third_party/WebKit/Source/modules/battery/BatteryManager.cpp
index 8fdf4e88a974353762890c2ecfa78c1e0fc2f160..fbcf9639f411e8b48ac5b8b97b03a5004801180c 100644
--- a/third_party/WebKit/Source/modules/battery/BatteryManager.cpp
+++ b/third_party/WebKit/Source/modules/battery/BatteryManager.cpp
@@ -109,14 +109,14 @@ void BatteryManager::resume() {
 
 void BatteryManager::contextDestroyed() {
   m_hasEventListener = false;
-  m_batteryProperty.clear();
+  m_batteryProperty = nullptr;
   stopUpdating();
 }
 
 bool BatteryManager::hasPendingActivity() const {
   // Prevent V8 from garbage collecting the wrapper object if there are
   // event listeners attached to it.
-  return hasEventListeners();
+  return getExecutionContext() && hasEventListeners();
 }
 
 DEFINE_TRACE(BatteryManager) {