Revert "Allow for using a different set of default behaviors."

This reverts commit 3cc069186c.

src/ol/handler/MouseWheel.js

@@ -47,9 +47,28 @@ ol.handler.MouseWheel.prototype.handleMouseWheel = function(e) {
     var newE = new ol.events.MapEvent(ol.events.MapEventType.MOUSEWHEEL, e);
     var rt = goog.events.dispatchEvent(this.map_, newE);
     if (rt) {
-        var defaultControl = this.map_.getDefaultControl();
-        if (defaultControl) {
-            defaultControl.defaultMouseWheel(newE);
-        }
+        this.defaultMouseWheel(e);
     }
-};
+};
+
+/**
+ * @param {goog.events.MouseWheelEvent} e
+ */
+ol.handler.MouseWheel.prototype.defaultMouseWheel = function(e) {
+    var me = this;
+    if (e.deltaY === 0 || me.zoomBlocked_) {
+        return;
+    }
+    me.zoomBlocked_ = window.setTimeout(function() {
+        me.zoomBlocked_ = null;
+    }, 200);
+
+    var map = me.map_,
+        step = e.deltaY / Math.abs(e.deltaY);
+    map.setZoom(map.getZoom() - step,
+                goog.style.getRelativePosition(e, this.element_));
+
+    // We don't want the page to scroll.
+    // (MouseWheelEvent is a BrowserEvent)
+    e.preventDefault();
+};