Prevent WebMediaPlayerImpl from dereferencing stale Frame pointers on Document changes.

Source/core/html/HTMLMediaElement.cpp

Index: Source/core/html/HTMLMediaElement.cpp
diff --git a/Source/core/html/HTMLMediaElement.cpp b/Source/core/html/HTMLMediaElement.cpp
index 6440307b61afc4f36bd2e4df3be7da234189fd09..21a10f48eedc1c3f7369d360c2df26f80153144d 100644
--- a/Source/core/html/HTMLMediaElement.cpp
+++ b/Source/core/html/HTMLMediaElement.cpp
@@ -353,6 +353,8 @@ HTMLMediaElement::~HTMLMediaElement()
 
 void HTMLMediaElement::didMoveToNewDocument(Document* oldDocument)
 {
+    LOG(Media, "HTMLMediaElement::didMoveToNewDocument");
+
     if (m_shouldDelayLoadEvent) {
         if (oldDocument)
             oldDocument->decrementLoadEventDelayCount();
@@ -364,6 +366,13 @@ void HTMLMediaElement::didMoveToNewDocument(Document* oldDocument)
 
     addElementToDocumentMap(this, document());
 
+    // FIXME: This is a temporary fix to prevent this object from causing the
+    // MediaPlayer to dereference Frame and FrameLoader pointers from the
+    // previous document. A proper fix would provide a mechanism to allow this
+    // object to refresh the MediaPlayer's Frame and FrameLoader references on
+    // document changes so that playback can be resumed properly.
+    userCancelledLoad();
+
     HTMLElement::didMoveToNewDocument(oldDocument);
 }