Migrate signin error messages to the new avatar bubble

chrome/browser/signin/signin_ui_util.h

Index: chrome/browser/signin/signin_ui_util.h
diff --git a/chrome/browser/signin/signin_ui_util.h b/chrome/browser/signin/signin_ui_util.h
index 4697ff7db50ba770bcc49cb33d644c89125859f5..68010c92ee6e2fbca9ce129795558555be3cf942 100644
--- a/chrome/browser/signin/signin_ui_util.h
+++ b/chrome/browser/signin/signin_ui_util.h
@@ -27,7 +27,7 @@ GlobalError* GetSignedInServiceError(Profile* profile);
 // Returns all errors reported by signed in services.
 std::vector<GlobalError*> GetSignedInServiceErrors(Profile* profile);
 
-// Return the label that should be displayed in the signin menu (i.e.
+// Returns the label that should be displayed in the signin menu (i.e.
 // "Sign in to Chromium", "Signin Error...", etc).
 base::string16 GetSigninMenuLabel(Profile* profile);
 
@@ -36,8 +36,12 @@ void GetStatusLabelsForAuthError(Profile* profile,
                                  base::string16* status_label,
                                  base::string16* link_label);
 
+// Initializes signin-related preferences.
 void InitializePrefsForProfile(Profile* profile);
 
+// Shows a learn more page for signin errors.
+void ShowSigninErrorLearnMorePage(Profile* profile);
+
 }  // namespace signin_ui_util
 
 #endif  // CHROME_BROWSER_SIGNIN_SIGNIN_UI_UTIL_H_