Get rid of goog.functions

src/ol/renderer/canvas/canvasimagelayerrenderer.js

@@ -1,8 +1,8 @@
 goog.provide('ol.renderer.canvas.ImageLayer');
 
 goog.require('goog.asserts');
-goog.require('goog.functions');
 goog.require('goog.vec.Mat4');
+goog.require('ol.functions');
 goog.require('ol.ImageBase');
 goog.require('ol.ViewHint');
 goog.require('ol.dom');
@@ -87,7 +87,7 @@ ol.renderer.canvas.ImageLayer.prototype.forEachLayerAtPixel = function(pixel, fr
     ol.vec.Mat4.multVec2(
         frameState.pixelToCoordinateMatrix, coordinate, coordinate);
     var hasFeature = this.forEachFeatureAtCoordinate(
-        coordinate, frameState, goog.functions.TRUE, this);
+        coordinate, frameState, ol.functions.TRUE, this);
 
     if (hasFeature) {
       return callback.call(thisArg, this.getLayer());