src/vs/workbench/services/workingCopy/common/workingCopyHistoryService.ts/WorkingCopyHistoryService/removeEntry
class WorkingCopyHistoryService:	async removeEntry(entry: IWorkingCopyHistoryEntry, token: CancellationToken): Promise<boolean> {

		// Resolve history model for working copy
		const model = await this.getModel(entry.workingCopy.resource);
		if (token.isCancellationRequested) {
			return false;
		}

		// Remove from model
		return model.removeEntry(entry, token);
	}