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diff --git a/chrome/browser/google_service_auth_error.h b/chrome/browser/google_service_auth_error.h
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+// Copyright (c) 2009 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 challenges.
+
+// A GoogleServiceAuthError without additional data is just a State, defined
+// below. A case could be made to have this relation implicit, to allow raising
+// error events concisely by doing OnAuthError(GoogleServiceAuthError::NONE),
+// for example. But the truth is this class is ever so slightly more than a
+// transparent wrapper around 'State' due to additional Captcha data
+// (e.g consider operator=), and this would violate the style guide. Thus,
+// you must explicitly use the constructor when all you have is a State.
+// The good news is the implementation nests the enum inside a class, so you
+// may forward declare and typedef GoogleServiceAuthError to something shorter
+// in the comfort of your own translation unit.
+
+#ifndef CHROME_BROWSER_GOOGLE_SERVICE_AUTH_ERROR_H_
+#define CHROME_BROWSER_GOOGLE_SERVICE_AUTH_ERROR_H_
+
+#include <string>
+#include "googleurl/src/gurl.h"
+
+class GoogleServiceAuthError {
+ public:
+  enum State {
+    // The user is authenticated.
+    NONE = 0,
+
+    // The credentials supplied to GAIA were either invalid, or the locally
+    // cached credentials have expired.
+    INVALID_GAIA_CREDENTIALS,
+
+    // The GAIA user is not authorized to use the service.
+    USER_NOT_SIGNED_UP,
+
+    // Could not connect to server to verify credentials. This could be in
+    // response to either failure to connect to GAIA or failure to connect to
+    // the service needing GAIA tokens during authentication.
+    CONNECTION_FAILED,
+
+    // The user needs to satisfy a CAPTCHA challenge to unlock their account.
+    // If no other information is available, this can be resolved by visiting
+    // https://www.google.com/accounts/DisplayUnlockCaptcha. Otherwise,
+    // captcha() will provide details about the associated challenge.
+    CAPTCHA_REQUIRED,
+  };
+
+  // Additional data for CAPTCHA_REQUIRED errors.
+  struct Captcha {
+    Captcha() {}
+    Captcha(const std::string& t, const GURL& img, const GURL& unlock)
+        : token(t), image_url(img), unlock_url(unlock) {}
+    std::string token;  // Globally identifies the specific CAPTCHA challenge.
+    GURL image_url;     // The CAPTCHA image to show the user.
+    GURL unlock_url;    // Pretty unlock page containing above captcha.
+  };
+
+  // Construct a GoogleServiceAuthError from a State with no additional data.
+  explicit GoogleServiceAuthError(State s) : state_(s) {}
+
+  // Construct a CAPTCHA_REQUIRED error with CAPTCHA challenge data.
+  static GoogleServiceAuthError FromCaptchaChallenge(
+      const std::string& captcha_token,
+      const GURL& captcha_image_url,
+      const GURL& captcha_unlock_url) {
+    return GoogleServiceAuthError(CAPTCHA_REQUIRED, captcha_token,
+                                  captcha_image_url, captcha_unlock_url);
+  }
+
+  // Provided for convenience for clients needing to reset an instance to NONE.
+  // (avoids err_ = GoogleServiceAuthError(GoogleServiceAuthError::NONE), due
+  // to explicit class and State enum relation. Note: shouldn't be inlined!
+  static const GoogleServiceAuthError None() {
+    static const GoogleServiceAuthError e(NONE);
+    return e;
+  }
+
+  // The error information.
+  const State& state() const { return state_; }
+  const Captcha& captcha() const { return captcha_; }
+
+ private:
+  GoogleServiceAuthError(State s, const std::string& captcha_token,
+                         const GURL& captcha_image_url,
+                         const GURL& captcha_unlock_url)
+      : state_(s),
+        captcha_(captcha_token, captcha_image_url, captcha_unlock_url) {
+  }
+
+  State state_;
+  Captcha captcha_;
+};
+
+#endif  // CHROME_BROWSER_GOOGLE_SERVICE_AUTH_ERROR_H_