Remove unused ol.size.equals function

src/ol/size.js

@@ -18,17 +18,6 @@ ol.size.buffer = function(size, buffer, opt_size) {
 };
 
 
-/**
- * Compares sizes for equality.
- * @param {ol.Size} a Size.
- * @param {ol.Size} b Size.
- * @return {boolean} Equals.
- */
-ol.size.equals = function(a, b) {
-  return a[0] == b[0] && a[1] == b[1];
-};
-
-
 /**
  * Determines if a size has a positive area.
  * @param {ol.Size} size The size to test.