Refactor user pods to use authType property for distinct authentication modes.

chrome/browser/ui/webui/chromeos/login/screenlock_icon_provider.cc

 // Copyright 2013 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/chromeos/login/screenlock_icon_provider.h"
 
 namespace chromeos {
 
 ScreenlockIconProvider::ScreenlockIconProvider() {}
 
 ScreenlockIconProvider::~ScreenlockIconProvider() {}
 
 void ScreenlockIconProvider::AddIcon(const std::string& username,
                                      const gfx::Image& icon) {
   user_icon_map_[username] = icon;
 }
 
+void ScreenlockIconProvider::RemoveIcon(const std::string& username) {
+  if (user_icon_map_.find(username) != user_icon_map_.end())
+    user_icon_map_.erase(username);
+}
+
 gfx::Image ScreenlockIconProvider::GetIcon(const std::string& username) {
   if (user_icon_map_.find(username) == user_icon_map_.end())
     return gfx::Image();
   return user_icon_map_[username];
 }
 
 void ScreenlockIconProvider::Clear() {
   user_icon_map_.clear();
 }
 
 }  // namespace chromeos