Reworked attribution handling

src/ol/renderer/webgl/imagelayer.js

@@ -190,7 +190,6 @@ ol.renderer.webgl.ImageLayer.prototype.prepareFrame = function(frameState, layer
     this.image_ = image;
     this.texture = texture;
 
-    this.updateAttributions(frameState.attributions, image.getAttributions());
     this.updateLogos(frameState, imageSource);
   }
 

src/ol/renderer/webgl/vectorlayer.js

@@ -215,8 +215,6 @@ ol.renderer.webgl.VectorLayer.prototype.prepareFrame = function(frameState, laye
   var vectorLayer = /** @type {ol.layer.Vector} */ (this.getLayer());
   var vectorSource = vectorLayer.getSource();
 
-  this.updateAttributions(
-      frameState.attributions, vectorSource.getAttributions());
   this.updateLogos(frameState, vectorSource);
 
   var animating = frameState.viewHints[ol.ViewHint.ANIMATING];