src/vs/platform/extensionManagement/node/extensionsWatcher.ts/ExtensionsWatcher/onDidInstallExtension
class ExtensionsWatcher:	private onDidInstallExtension(e: DidInstallExtensionEvent): void {
		this.removeInstallingExtension(e.identifier);
		if (!e.error) {
			this.addInstalledExtension(e.identifier);
		}
	}