Robustify state-transitions in HTMLMediaElement::startDeferredLoad

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 7e35648c5129df042d79990079a4981c2a41c632..339462b841a58692600e413297203542e8a6ea5f 100644
--- a/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
@@ -1116,6 +1116,8 @@ void HTMLMediaElement::startDeferredLoad()
         executeDeferredLoad();
         return;
     }
+    if (m_deferredLoadState == ExecuteOnStopDelayingLoadEventTask)
+        return;
     ASSERT(m_deferredLoadState == WaitingForStopDelayingLoadEventTask);
     m_deferredLoadState = ExecuteOnStopDelayingLoadEventTask;
 }