Avoid creating duplicate projections in COG examples

examples/cog-overviews.js

@@ -1,6 +1,5 @@
 import GeoTIFF from '../src/ol/source/GeoTIFF.js';
 import Map from '../src/ol/Map.js';
-import Projection from '../src/ol/proj/Projection.js';
 import TileLayer from '../src/ol/layer/WebGLTile.js';
 import View from '../src/ol/View.js';
 import proj4 from 'proj4';
@@ -10,11 +9,6 @@ import {register} from '../src/ol/proj/proj4.js';
 proj4.defs('EPSG:32645', '+proj=utm +zone=45 +datum=WGS84 +units=m +no_defs');
 register(proj4);
 
-const projection = new Projection({
-  code: 'EPSG:32645',
-  extent: [166021.44, 0.0, 534994.66, 9329005.18],
-});
-
 const sourceExtent = [382200, 2279370, 610530, 2512500];
 
 const base =
@@ -60,9 +54,9 @@ const map = new Map({
     }),
   ],
   view: new View({
+    projection: 'EPSG:32645',
     center: getCenter(sourceExtent),
     extent: sourceExtent,
     zoom: 8,
-    projection: projection,
   }),
 });