Delete some dead code.

google_apis/gaia/google_service_auth_error.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // A GoogleServiceAuthError is immutable, plain old data representing an
 // error from an attempt to authenticate with a Google service.
 // It could be from Google Accounts itself, or any service using Google
 // Accounts (e.g expired credentials).  It may contain additional data such as
 // captcha or OTP challenges.
 
@@ skipping 171 matching lines @@
 
   // Returns a message describing the error.
   std::string ToString() const;
 
  private:
   GoogleServiceAuthError(State s, int error);
 
   // Construct a GoogleServiceAuthError from |state| and |error_message|.
   GoogleServiceAuthError(State state, const std::string& error_message);
 
-  explicit GoogleServiceAuthError(const std::string& error_message);
-
   GoogleServiceAuthError(State s, const std::string& captcha_token,
                          const GURL& captcha_audio_url,
                          const GURL& captcha_image_url,
                          const GURL& captcha_unlock_url,
                          int image_width,
                          int image_height);
 
-  GoogleServiceAuthError(State s, const std::string& captcha_token,
-                         const std::string& prompt_text,
-                         const std::string& alternate_text,
-                         int field_length);
-
   State state_;
   Captcha captcha_;
   SecondFactor second_factor_;
   int network_error_;
   std::string error_message_;
 };
 
 #endif  // GOOGLE_APIS_GAIA_GOOGLE_SERVICE_AUTH_ERROR_H_