Revert "cancelAnimationFrame for reset when detach is called (#282)"

This reverts commit 1e40612.

Author: marcj

src/ResizeSensor.js

@@ -102,8 +102,6 @@
      * @constructor
      */
     var ResizeSensor = function(element, callback) {
-        var lastAnimationFrame = 0;
-        
         /**
          *
          * @constructor
@@ -206,7 +204,7 @@
             var lastWidth = 0;
             var lastHeight = 0;
             var initialHiddenCheck = true;
-            lastAnimationFrame = 0;
+            var lastAnimationFrame = 0;
 
             var resetExpandShrink = function () {
                 var width = element.offsetWidth;
@@ -283,19 +281,14 @@
             addEvent(shrink, 'scroll', onScroll);
 
             // Fix for custom Elements
-            lastAnimationFrame = requestAnimationFrame(reset);
+            requestAnimationFrame(reset);
         }
 
         forEachElement(element, function(elem){
             attachResizeEvent(elem, callback);
         });
 
         this.detach = function(ev) {
-            // clean up the unfinished animation frame to prevent a potential endless requestAnimationFrame of reset
-            if (!lastAnimationFrame) {
-                window.cancelAnimationFrame(lastAnimationFrame);
-                lastAnimationFrame = 0;
-            }
             ResizeSensor.detach(element, ev);
         };