src/vs/workbench/api/browser/mainThreadWebviewPanels.ts/WebviewInputStore/delete
class WebviewInputStore:	public delete(handle: string): void {
		const input = this.getInputForHandle(handle);
		this._handlesToInputs.delete(handle);
		if (input) {
			this._inputsToHandles.delete(input);
		}
	}