Deprecate the imageSmoothing option for sources

src/ol/source/common.js

@@ -7,12 +7,3 @@
  * @type {string}
  */
 export const DEFAULT_WMS_VERSION = '1.3.0';
-
-/**
- * Context options to disable image smoothing.
- * @type {Object}
- */
-export const IMAGE_SMOOTHING_DISABLED = {
-  imageSmoothingEnabled: false,
-  msImageSmoothingEnabled: false,
-};