src/vs/workbench/contrib/debug/common/debugModel.ts/DebugModel/removeWatchExpressions
class DebugModel:	removeWatchExpressions(id: string | null = null): void {
		this.watchExpressions = id ? this.watchExpressions.filter(we => we.getId() !== id) : [];
		this._onDidChangeWatchExpressions.fire(undefined);
	}