[ol.layer.XYZ] no need to call setResolutions

src/ol/layer/XYZ.js

@@ -24,17 +24,6 @@ ol.layer.XYZ = function(url) {
     goog.base(this);
 
     this.setMaxResolution(156543.03390625);
-
-    this.setResolutions([
-        156543.03390625, 78271.516953125, 39135.7584765625,
-        19567.87923828125, 9783.939619140625, 4891.9698095703125,
-        2445.9849047851562, 1222.9924523925781, 611.4962261962891,
-        305.74811309814453, 152.87405654907226, 76.43702827453613,
-        38.218514137268066, 19.109257068634033, 9.554628534317017,
-        4.777314267158508, 2.388657133579254, 1.194328566789627,
-        0.5971642833948135, 0.29858214169740677, 0.14929107084870338,
-        0.07464553542435169
-    ]);
 };
 
 goog.inherits(ol.layer.XYZ, ol.layer.TileLayer);