ImageUtils: Clean up.

src/extras/ImageUtils.js

@@ -10,18 +10,21 @@ const ImageUtils = {
 
 	getDataURL: function ( image ) {
 
-		let canvas;
-
-		var src = image.src;
-		if ( /^data:/i.test( src ) ) {
+		if ( /^data:/i.test( image.src ) ) {
 
 			return image.src;
 
-		} else if ( typeof HTMLCanvasElement == 'undefined' ) {
+		}
+
+		if ( typeof HTMLCanvasElement == 'undefined' ) {
 
 			return image.src;
 
-		} else if ( image instanceof HTMLCanvasElement ) {
+		}
+
+		let canvas;
+
+		if ( image instanceof HTMLCanvasElement ) {
 
 			canvas = image;