Fix an AutoplayUmaHelper crash

third_party/WebKit/Source/core/html/AutoplayUmaHelper.cpp

Index: third_party/WebKit/Source/core/html/AutoplayUmaHelper.cpp
diff --git a/third_party/WebKit/Source/core/html/AutoplayUmaHelper.cpp b/third_party/WebKit/Source/core/html/AutoplayUmaHelper.cpp
index 4f3887add4e659264c3b878f32ebc3748599f5ff..a8d92a7d18681fc07ddcf3edcdde20d4deff637c 100644
--- a/third_party/WebKit/Source/core/html/AutoplayUmaHelper.cpp
+++ b/third_party/WebKit/Source/core/html/AutoplayUmaHelper.cpp
@@ -98,7 +98,7 @@ void AutoplayUmaHelper::didMoveToNewDocument(Document& oldDocument)
 
     if (oldDocument.domWindow())
         oldDocument.domWindow()->removeEventListener(EventTypeNames::unload, this, false);
-    if (m_element && m_element->document().domWindow())
+    if (m_element->document().domWindow())
         m_element->document().domWindow()->addEventListener(EventTypeNames::unload, this, false);
 }
 
@@ -220,7 +220,7 @@ void AutoplayUmaHelper::maybeStopRecordingMutedVideoOffscreenDuration()
 
 void AutoplayUmaHelper::maybeUnregisterUnloadListener()
 {
-    if (!shouldListenToUnloadEvent() && m_element && m_element->document().domWindow())
+    if (!shouldListenToUnloadEvent() && m_element->document().domWindow())
         m_element->document().domWindow()->removeEventListener(EventTypeNames::unload, this, false);
 }