Fix combine test build (#11080)

Author: paulb777

FirebaseCombineSwift/Tests/Unit/Auth/AuthMocks.swift

@@ -94,6 +94,11 @@ extension AuthBackendImplementationMock {
     fatalError("You need to implement \(#function) in your mock.")
   }
 
+  func revokeToken(_ request: FIRRevokeTokenRequest,
+                   callback: @escaping FIRRevokeTokenResponseCallback) {
+    fatalError("You need to implement \(#function) in your mock.")
+  }
+
   func signIn(withGameCenter request: FIRSignInWithGameCenterRequest,
               callback: @escaping FIRSignInWithGameCenterResponseCallback) {
     fatalError("You need to implement \(#function) in your mock.")

FirebaseCombineSwift/Tests/Unit/FirebaseCombine-unit-Bridging-Header.h

@@ -44,6 +44,8 @@
 #import "FirebaseAuth/Sources/Backend/RPC/FIRGetProjectConfigResponse.h"
 #import "FirebaseAuth/Sources/Backend/RPC/FIRResetPasswordRequest.h"
 #import "FirebaseAuth/Sources/Backend/RPC/FIRResetPasswordResponse.h"
+#import "FirebaseAuth/Sources/Backend/RPC/FIRRevokeTokenRequest.h"
+#import "FirebaseAuth/Sources/Backend/RPC/FIRRevokeTokenResponse.h"
 #import "FirebaseAuth/Sources/Backend/RPC/FIRSecureTokenRequest.h"
 #import "FirebaseAuth/Sources/Backend/RPC/FIRSecureTokenResponse.h"
 #import "FirebaseAuth/Sources/Backend/RPC/FIRSendVerificationCodeRequest.h"