Revert of [Blink>Media] Fix a crash in autoplay caused by delayed visibility observation

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

Index: third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp b/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
index caa74795f478b099fb9287f3227341133efff92a..a43e6d66f8ee0b4559685b200eeaa299fc9e97a8 100644
--- a/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
@@ -4005,10 +4005,6 @@
 void HTMLMediaElement::onVisibilityChangedForAutoplay(bool isVisible) {
   if (!isVisible)
     return;
-  // Visibility change might be notified after stopping the observer, as it is a
-  // delayed task. Abort the steps if this happens.
-  if (!m_autoplayVisibilityObserver)
-    return;
 
   if (shouldAutoplay()) {
     m_paused = false;