Fix potential null pointer access in HTMLMediaElement::seek

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 9ae9d1d0dab809b057dec678a4eef22686c8db50..f2ff751f0c19c6d0c3bda93c4e723ed6074036b7 100644
--- a/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
@@ -1690,7 +1690,10 @@ void HTMLMediaElement::seek(double time)
     WTF_LOG(Media, "HTMLMediaElement::seek(%p, %f)", this, time);
 
     // 2 - If the media element's readyState is HAVE_NOTHING, abort these steps.
-    if (m_readyState == HAVE_NOTHING)
+    // FIXME: remove m_webMediaPlayer check once we figure out how
+    // m_webMediaPlayer is going out of sync with readystate.
+    // m_webMediaPlayer is cleared but readystate is not set to HAVE_NOTHING.
+    if (!m_webMediaPlayer || m_readyState == HAVE_NOTHING)
         return;
 
     // Ignore preload none and start load if necessary.