src/vs/workbench/services/extensionManagement/browser/extensionEnablementService.ts/ExtensionsManager/onDidUninstallExtensions
class ExtensionsManager:	private onDidUninstallExtensions(identifiers: IExtensionIdentifier[], server: IExtensionManagementServer): void {
		const removed: IExtension[] = [];
		for (const identifier of identifiers) {
			const index = this._extensions.findIndex(e => areSameExtensions(e.identifier, identifier) && this.extensionManagementServerService.getExtensionManagementServer(e) === server);
			if (index !== -1) {
				removed.push(...this._extensions.splice(index, 1));
			}
		}
		if (removed.length) {
			this._onDidChangeExtensions.fire({ added: [], removed });
		}
	}