remove unused code

Author: greggman

webgpu/webgpu-compute-shaders-histogram-video.html

@@ -45,12 +45,7 @@
 
 async function main() {
   const adapter = await navigator.gpu?.requestAdapter();
-  const canTimestamp = adapter?.features.has('timestamp-query');
-  const device = await adapter?.requestDevice({
-    requiredFeatures: [
-      ...(canTimestamp ? ['timestamp-query'] : []),
-    ],
-  });
+  const device = await adapter?.requestDevice();
   if (!device) {
     fail('need a browser that supports WebGPU');
     return;