Remove authenticated_ fields from stubs.

remoting/host/user_authenticator_fake.h

Index: remoting/host/user_authenticator_fake.h
diff --git a/remoting/host/user_authenticator_fake.h b/remoting/host/user_authenticator_fake.h
index f35193114bef27b65ea533b0b5f966c88297d535..faf1171da0a43899107dc8d5c2c18ec76e79056b 100644
--- a/remoting/host/user_authenticator_fake.h
+++ b/remoting/host/user_authenticator_fake.h
@@ -12,10 +12,7 @@
 
 namespace remoting {
 
-// Temporary stub for platforms where this hasn't been implemented yet.
-
-// TODO(lambroslambrou): Implement properly on those platforms, then
-// delete this stub when it's no longer needed.
+// A fake UserAuthenticator, which accepts all but one user/password pair.
 class UserAuthenticatorFake : public UserAuthenticator {
  public:
   UserAuthenticatorFake();
@@ -24,6 +21,10 @@ class UserAuthenticatorFake : public UserAuthenticator {
   virtual bool Authenticate(const std::string& username,
                             const std::string& password);
 
+  // Get the user/password pair that a UserAuthenticatorFake rejects.
+  static const char* fail_username();
+  static const char* fail_password();
+
  private:
   DISALLOW_COPY_AND_ASSIGN(UserAuthenticatorFake);
 };