Revert "Fix video decoder stalls issue in webgpu_video_frame.html"

[Mugen87]

Reverts #30380

[Mugen87]

@ycw Sorry, I had to revert. On macOS and Chrome, the demo throws now runtime errors:

Uncaught OperationError: Failed to execute 'importExternalTexture' on 'GPUDevice': Failed to import texture from video frame that doesn't have back resource
at WebGPUBindingUtils.createBindGroup (WebGPUBindingUtils.js:399:1)
at WebGPUBindingUtils.createBindings (WebGPUBindingUtils.js:263:1)
at WebGPUBackend.updateBindings (WebGPUBackend.js:1703:1)
at Bindings._update (Bindings.js:304:1)
at Bindings._updateBindings (Bindings.js:165:1)
at Bindings.updateForRender (Bindings.js:152:1)
at WebGPURenderer._renderObjectDirect (Renderer.js:2776:1)
at WebGPURenderer.renderObject (Renderer.js:2715:1)
at WebGPURenderer._renderObjects (Renderer.js:2630:1)
at WebGPURenderer._renderScene (Renderer.js:1368:1)

[ycw]

it's because you removed scene.remove( mesh ) by accident at 299364c :D

[Mugen87]

Oh dear! Do you think you can remake the PR with the scene.remove( mesh statement? Sorry for the back-and-forth. Just trying to reduce the code we need to a bare minimum.

[ycw]

no problem. at #30385. FWIW, it should be fine to keep render the mesh IF this TODO is fixed 🤷🏻