Remove gratuitous debug assertions

src/ol/renderer/webgl/webglmaprenderer.js

@@ -182,8 +182,6 @@ ol.renderer.webgl.Map.prototype.bindTileTexture = function(tile, tileSize, tileG
   var tileKey = tile.getKey();
   if (this.textureCache_.containsKey(tileKey)) {
     var textureCacheEntry = this.textureCache_.get(tileKey);
-    goog.DEBUG && console.assert(textureCacheEntry,
-        'a texture cache entry exists for key %s', tileKey);
     gl.bindTexture(ol.webgl.TEXTURE_2D, textureCacheEntry.texture);
     if (textureCacheEntry.magFilter != magFilter) {
       gl.texParameteri(

src/ol/renderer/webgl/webgltilelayerrenderer.js

@@ -258,7 +258,6 @@ ol.renderer.webgl.TileLayer.prototype.prepareFrame = function(frameState, layerS
         if (!drawable && tile.interimTile) {
           tile = tile.interimTile;
         }
-        goog.DEBUG && console.assert(tile);
         tileState = tile.getState();
         if (tileState == ol.TileState.LOADED) {
           if (mapRenderer.isTileTextureLoaded(tile)) {

src/ol/renderer/webgl/webglvectorlayerrenderer.js

@@ -120,7 +120,6 @@ ol.renderer.webgl.VectorLayer.prototype.forEachFeatureAtCoordinate = function(co
          * @return {?} Callback result.
          */
         function(feature) {
-          goog.DEBUG && console.assert(feature !== undefined, 'received a feature');
           var key = ol.getUid(feature).toString();
           if (!(key in features)) {
             features[key] = true;