Handle the case of removing an extension from the extension host

src/vs/workbench/api/node/extHost.protocol.ts

@@ -742,6 +742,7 @@ export interface ExtHostExtensionServiceShape {
 	$activate(extensionId: ExtensionIdentifier, activationEvent: string): Promise<void>;
 
 	$addExtension(extension: IExtensionDescription): Promise<void>;
+	$removeExtension(extension: ExtensionIdentifier): Promise<void>;
 
 	$test_latency(n: number): Promise<number>;
 	$test_up(b: Buffer): Promise<number>;

src/vs/workbench/api/node/extHostExtensionService.ts

@@ -675,6 +675,11 @@ export class ExtHostExtensionService implements ExtHostExtensionServiceShape {
 		return Promise.resolve(undefined);
 	}
 
+	public $removeExtension(extensionId: ExtensionIdentifier): Promise<void> {
+		this._registry.remove(extensionId);
+		return Promise.resolve(undefined);
+	}
+
 	public async $test_latency(n: number): Promise<number> {
 		return n;
 	}