Fix EffectComposer reference to renderer.

should be `this.renderer`

examples/js/postprocessing/EffectComposer.js

@@ -110,7 +110,7 @@ THREE.EffectComposer.prototype = {
 
 			renderTarget = this.renderTarget1.clone();
 
-			var pixelRatio = renderer.getPixelRatio();
+			var pixelRatio = this.renderer.getPixelRatio();
 
 			renderTarget.width  = Math.floor( this.renderer.context.canvas.width  / pixelRatio );
 			renderTarget.height = Math.floor( this.renderer.context.canvas.height / pixelRatio );