Remove use of goog.array.flatten

src/ol/array.js

@@ -127,3 +127,18 @@ ol.array.reverseSubArray = function(arr, begin, end) {
     --end;
   }
 };
+
+/**
+ * @param {Array.<*>} arr Array.
+ * @return {!Array<?>} Flattened Array.
+ */
+ol.array.flatten = function(arr) {
+  var data = arr.reduce(function(flattened, value) {
+    if (goog.isArray(value)) {
+      return flattened.concat(ol.array.flatten(value));
+    } else {
+      return flattened.concat(value);
+    }
+  }, []);
+  return data;
+};

src/ol/format/esrijsonformat.js

@@ -1,8 +1,8 @@
 goog.provide('ol.format.EsriJSON');
 
-goog.require('goog.array');
 goog.require('goog.asserts');
 goog.require('goog.object');
+goog.require('ol.array');
 goog.require('ol.Feature');
 goog.require('ol.extent');
 goog.require('ol.format.Feature');
@@ -104,7 +104,7 @@ ol.format.EsriJSON.convertRings_ = function(rings, layout) {
   var holes = [];
   var i, ii;
   for (i = 0, ii = rings.length; i < ii; ++i) {
-    var flatRing = goog.array.flatten(rings[i]);
+    var flatRing = ol.array.flatten(rings[i]);
     // is this ring an outer ring? is it clockwise?
     var clockwise = ol.geom.flat.orient.linearRingIsClockwise(flatRing, 0,
         flatRing.length, layout.length);