Make some code gender neutral.

chrome/browser/ui/user_manager.h

 // Copyright (c) 2014 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.
 
 #ifndef CHROME_BROWSER_UI_USER_MANAGER_H_
 #define CHROME_BROWSER_UI_USER_MANAGER_H_
 
 #include "base/callback_forward.h"
 #include "base/macros.h"
 #include "chrome/browser/profiles/profile_window.h"
@@ skipping 55 matching lines @@
   //   reauthenticated.
   // |reason| can be REASON_UNLOCK or REASON_REAUTHENTICATION to indicate
   // whether this is a reauth or unlock scenario.
   static void ShowReauthDialog(content::BrowserContext* browser_context,
                                const std::string& email,
                                signin_metrics::Reason reason);
 
   // Hides the reauth dialog if it is showing.
   static void HideReauthDialog();
 
-  // Shows a dialog where the user login his or her profile by the first time
-  // via user manager.
+  // Shows a dialog where the user logs into their profile for the first time
+  // via the user manager.
   static void ShowSigninDialog(content::BrowserContext* browser_context,
                                const base::FilePath& profile_path);
 
   // Display local sign in error message without browser.
   static void DisplayErrorMessage();
 
   // Get the path of profile that is being signed in.
   static base::FilePath GetSigninProfilePath();
 
   // Abstract base class for performing online reauthentication of profiles in
@@ skipping 17 matching lines @@
     content::WebContents* guest_web_contents_;
 
     DISALLOW_COPY_AND_ASSIGN(BaseReauthDialogDelegate);
   };
 
  private:
   DISALLOW_COPY_AND_ASSIGN(UserManager);
 };
 
 #endif  // CHROME_BROWSER_UI_USER_MANAGER_H_