Delete some dead code.

google_apis/gaia/google_service_auth_error.h

Index: google_apis/gaia/google_service_auth_error.h
diff --git a/google_apis/gaia/google_service_auth_error.h b/google_apis/gaia/google_service_auth_error.h
index 19fdb51540563b5691016e64016855fa598477f8..3d441ef9bae2e7c4c7fac50b291b69664779a9fe 100644
--- a/google_apis/gaia/google_service_auth_error.h
+++ b/google_apis/gaia/google_service_auth_error.h
@@ -189,8 +189,6 @@ class GoogleServiceAuthError {
   // 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,
@@ -198,11 +196,6 @@ class GoogleServiceAuthError {
                          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_;