src/vs/code/browser/workbench/workbench.ts/LocalStorageCredentialsProvider/doDeletePassword
class LocalStorageCredentialsProvider:	private async doDeletePassword(service: string, account: string): Promise<boolean> {
		let found = false;

		this._credentials = this.credentials.filter(credential => {
			if (credential.service === service && credential.account === account) {
				found = true;

				return false;
			}

			return true;
		});

		if (found) {
			this.save();
		}

		return found;
	}