Merge pull request #1184 from oterral/get_image_element

Fix getImageElement calls in canvas and webgl renderer

src/ol/renderer/canvas/canvasimagelayerrenderer.js

@@ -43,7 +43,7 @@ goog.inherits(ol.renderer.canvas.ImageLayer, ol.renderer.canvas.Layer);
  */
 ol.renderer.canvas.ImageLayer.prototype.getImage = function() {
   return goog.isNull(this.image_) ?
-      null : this.image_.getImageElement(this);
+      null : this.image_.getImageElement();
 };
 
 

src/ol/renderer/webgl/webglimagelayerrenderer.js

@@ -47,7 +47,7 @@ ol.renderer.webgl.ImageLayer.prototype.createTexture_ = function(image) {
   // http://www.khronos.org/webgl/wiki/WebGL_and_OpenGL_Differences#Non-Power_of_Two_Texture_Support
   // http://learningwebgl.com/blog/?p=2101
 
-  var imageElement = image.getImageElement(this);
+  var imageElement = image.getImageElement();
   var gl = this.getWebGLMapRenderer().getGL();
 
   var texture = gl.createTexture();