Put the signin error's "Learn More" link on its own line.

chrome/browser/ui/webui/signin/signin_error_ui.cc

 // Copyright 2016 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.
 
 #include "chrome/browser/ui/webui/signin/signin_error_ui.h"
 
 #include <vector>
 
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/browser_process.h"
@@ skipping 79 matching lines @@
         if (gaia::AreEmailsSame(base::UTF16ToUTF8(email),
                                 base::UTF16ToUTF8(entry->GetUserName()))) {
           handler->set_duplicate_profile_entry(entry);
           existing_name = entry->GetName();
         }
       }
     }
     DCHECK(!existing_name.empty());
     source->AddString(
         "signinErrorMessage",
-        l10n_util::GetStringFUTF16(
-            IDS_SIGNIN_ERROR_LEARN_MORE_LINK,
-            l10n_util::GetStringFUTF16(IDS_SYNC_USER_NAME_IN_USE_BY_ERROR,
-                                       existing_name)));
+        l10n_util::GetStringFUTF16(IDS_SYNC_USER_NAME_IN_USE_BY_ERROR,
+                                   existing_name));
     // Elide the existing name for the switch user button label.
     existing_name =
         gfx::TruncateString(existing_name, 10, gfx::CHARACTER_BREAK);
   } else {
-    source->AddString("signinErrorMessage",
-                      l10n_util::GetStringFUTF16(
-                          IDS_SIGNIN_ERROR_LEARN_MORE_LINK, last_login_result));
+    source->AddString("signinErrorMessage", last_login_result);
   }
 
   // Add button label strings.
   source->AddString("signinErrorSwitchLabel",
                     l10n_util::GetStringFUTF16(
                         IDS_SIGNIN_ERROR_SWITCH_BUTTON_LABEL, existing_name));
+  source->AddLocalizedString("signinErrorLearnMore",
+                             IDS_SIGNIN_ERROR_LEARN_MORE_LINK);
   source->AddLocalizedString("signinErrorCloseLabel",
                              IDS_SIGNIN_ERROR_CLOSE_BUTTON_LABEL);
   source->AddLocalizedString("signinErrorOkLabel",
                              IDS_SIGNIN_ERROR_OK_BUTTON_LABEL);
 
   base::DictionaryValue strings;
   webui::SetLoadTimeDataDefaults(g_browser_process->GetApplicationLocale(),
                                  &strings);
   source->AddLocalizedStrings(strings);
 
   content::WebUIDataSource::Add(webui_profile, source);
   web_ui->AddMessageHandler(handler);
 }