Do not set center constraint

This change slipped in accidently. Thanks @twpayne for catching
this.

src/objectliterals.jsdoc

@@ -89,8 +89,6 @@
  * Object literal with config options for the view.
  * @typedef {Object} ol.View2DOptions
  * @property {ol.Coordinate|undefined} center The view center in map projection.
- * @property {ol.Extent|undefined} maxExtent The maximum extent for the view.
- *     If configured, the view's center cannot be outside this extent.
  * @property {number|undefined} maxResolution The maximum resolution in map
  *     units per pixel.
  * @property {number|undefined} maxZoom The maximum zoom level for this view.

src/ol/view2d.js

@@ -4,7 +4,6 @@ goog.provide('ol.View2D');
 goog.provide('ol.View2DProperty');
 
 goog.require('goog.asserts');
-goog.require('goog.math');
 goog.require('ol.Constraints');
 goog.require('ol.IView2D');
 goog.require('ol.IView3D');
@@ -60,12 +59,6 @@ ol.View2D = function(opt_options) {
   values[ol.View2DProperty.PROJECTION] = ol.proj.createProjection(
       options.projection, 'EPSG:3857');
 
-  /**
-   * @private
-   * @type {ol.Extent}
-   */
-  this.maxExtent_ = goog.isDef(options.maxExtent) ? options.maxExtent : null;
-
   var parts = ol.View2D.createResolutionConstraint_(options);
 
   /**
@@ -359,10 +352,7 @@ ol.View2D.prototype.isDef = function() {
  * @param {ol.Coordinate|undefined} center Center.
  */
 ol.View2D.prototype.setCenter = function(center) {
-  this.set(ol.View2DProperty.CENTER, goog.isNull(this.maxExtent_) ? center : [
+  this.set(ol.View2DProperty.CENTER, center);
-    goog.math.clamp(center[0], this.maxExtent_[0], this.maxExtent_[1]),
-    goog.math.clamp(center[1], this.maxExtent_[2], this.maxExtent_[3])
-  ]);
 };
 goog.exportProperty(
     ol.View2D.prototype,