When HLS redirects are encountered recreate WebMediaPlayer.

third_party/WebKit/public/platform/WebMediaPlayer.h

Index: third_party/WebKit/public/platform/WebMediaPlayer.h
diff --git a/third_party/WebKit/public/platform/WebMediaPlayer.h b/third_party/WebKit/public/platform/WebMediaPlayer.h
index 23bb865aacad04ea587d54bce704efa9552ccfea..41d408d94fbf8c4dc387c70e72b4a8a6bb40bfc0 100644
--- a/third_party/WebKit/public/platform/WebMediaPlayer.h
+++ b/third_party/WebKit/public/platform/WebMediaPlayer.h
@@ -200,6 +200,10 @@ public:
     virtual void enabledAudioTracksChanged(const WebVector<TrackId>& enabledTrackIds) { }
     // |selectedTrackId| is null if no track is selected.
     virtual void selectedVideoTrackChanged(TrackId* selectedTrackId) { }
+
+    // Non-empty if loading has failed and the WebMediaPlayer has found a better
+    // URL that must be reloaded through the Blink loading process.
+    virtual WebURL alternativeSourceURL() const { return WebURL(); }
 };
 
 } // namespace blink