revert common/ file

Author: Brian Chen

common/api-review/functions-exp.api.md

@@ -16,7 +16,7 @@ export function getFunctions(app: FirebaseApp, regionOrCustomDomain?: string): F
 export function httpsCallable(functionsInstance: Functions, name: string, options?: HttpsCallableOptions): HttpsCallable;
 
 // @public
-export function useFunctionsEmulator(functionsInstance: Functions, host: string, port: number): void;
+export function useFunctionsEmulator(functionsInstance: Functions, origin: string): void;
 
 
 // (No @packageDocumentation comment for this package)