Continuation of CL 5685007, rename the singleton accessor method in more files.

chrome/browser/chromeos/login/existing_user_controller.cc

 // Copyright (c) 2010 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/chromeos/login/existing_user_controller.h"
 
 #include <algorithm>
 #include <functional>
 #include <map>
 
@@ skipping 174 matching lines @@
   // If there's only new user pod, show the guest session link on it.
   bool show_guest_link = controllers_.size() == 1;
   for (size_t i = 0; i < controllers_.size(); ++i) {
     (controllers_[i])->Init(static_cast<int>(i),
                             static_cast<int>(controllers_.size()),
                             show_guest_link);
   }
 
   EnableTooltipsIfNeeded(controllers_);
 
-  WmMessageListener::instance()->AddObserver(this);
+  WmMessageListener::GetInstance()->AddObserver(this);
 
   LoginUtils::Get()->PrewarmAuthentication();
   if (CrosLibrary::Get()->EnsureLoaded())
     CrosLibrary::Get()->GetLoginLibrary()->EmitLoginPromptReady();
 }
 
 void ExistingUserController::OwnBackground(
     views::Widget* background_widget,
     chromeos::BackgroundView* background_view) {
   DCHECK(!background_window_);
@@ skipping 27 matching lines @@
     background_view_->SetStatusAreaEnabled(enable);
   }
 }
 
 ExistingUserController::~ExistingUserController() {
   ClearErrors();
 
   if (background_window_)
     background_window_->Close();
 
-  WmMessageListener::instance()->RemoveObserver(this);
+  WmMessageListener::GetInstance()->RemoveObserver(this);
 
   STLDeleteElements(&controllers_);
 }
 
 void ExistingUserController::Delete() {
   delete_scheduled_instance_ = NULL;
   delete this;
 }
 
 void ExistingUserController::ProcessWmMessage(const WmIpc::Message& message,
@@ skipping 359 matching lines @@
 void ExistingUserController::RecoverEncryptedData(
     const std::string& old_password) {
   login_performer_->RecoverEncryptedData(old_password);
 }
 
 void ExistingUserController::ResyncEncryptedData() {
   login_performer_->ResyncEncryptedData();
 }
 
 }  // namespace chromeos