Fix bug 1113339: Use autoDetectRenderer instead of CanvasRenderer.
Fix bug 1113339: Use autoDetectRenderer instead of CanvasRenderer.

The autoDetectRenderer detects whether WebGL is supported and, if it is,
uses that for rendering graphics instead of Canvas.

In theory this is a performance boost, but the big win for us is that it
happens to also fix the rendering issues on Linux. Yay!
mozilla/lorax,mozilla/lorax