Reduce closure dependency, fix GET issue

examples/custom-icon.js

@@ -7,7 +7,7 @@ var logoElement = document.createElement('a');
 logoElement.href = 'http://www.osgeo.org/';
 logoElement.target = '_blank';
 
-var logoImage = new Image();
+var logoImage = document.createElement('img');
 logoImage.src = 'http://www.osgeo.org/sites/all/themes/osgeo/logo.png';
 
 logoElement.appendChild(logoImage);

externs/olx.js

@@ -7452,7 +7452,7 @@ olx.view.FitOptions.prototype.maxZoom;
  *     index: number,
  *     layerStates: Object.<number, ol.layer.LayerState>,
  *     layerStatesArray: Array.<ol.layer.LayerState>,
- *     logos: Object.<string, string>,
+ *     logos: Object.<string, (string|Element)>,
  *     pixelRatio: number,
  *     pixelToCoordinateMatrix: ol.vec.Mat4.Number,
  *     postRenderFunctions: Array.<ol.PostRenderFunction>,

src/ol/control/attributioncontrol.js

@@ -303,15 +303,16 @@ ol.control.Attribution.prototype.insertLogos_ = function(frameState) {
 
   var image, logoElement, logoKey;
   for (logoKey in logos) {
+    var logoValue = logos[logoKey];
+    if (logoValue instanceof HTMLElement) {
+      this.logoLi_.appendChild(logoValue);
+      logoElements[logoKey] = logoValue;
+    }
     if (!(logoKey in logoElements)) {
       image = new Image();
       image.src = logoKey;
-      var logoValue = logos[logoKey];
       if (logoValue === '') {
         logoElement = image;
-      } else if (goog.dom.isElement(logoValue)) {
-        goog.asserts.assertElement(logoValue);
-        logoElement = logoValue;
       } else {
         logoElement = goog.dom.createDom('A', {
           'href': logoValue

src/ol/map.js

@@ -1490,8 +1490,8 @@ ol.Map.createOptionsInternal = function(options) {
     var logo = options.logo;
     if (typeof logo === 'string') {
       logos[logo] = '';
-    } else if (goog.dom.isElement(logo)) {
-      logos['logo'] = logo;
+    } else if (logo instanceof HTMLElement) {
+      logos[goog.getUid(logo).toString()] = logo;
     } else if (goog.isObject(logo)) {
       goog.asserts.assertString(logo.href, 'logo.href should be a string');
       goog.asserts.assertString(logo.src, 'logo.src should be a string');