Replace chromeos::UserManager::Get() with chromeos::GetUserManager().

chrome/browser/notifications/message_center_settings_controller.cc

Index: chrome/browser/notifications/message_center_settings_controller.cc
diff --git a/chrome/browser/notifications/message_center_settings_controller.cc b/chrome/browser/notifications/message_center_settings_controller.cc
index 69e9ca9a6a39969b1e1c1b12b9e8f40656992793..0d68cde0733c155ac78ad62e17abf36fb7546f8f 100644
--- a/chrome/browser/notifications/message_center_settings_controller.cc
+++ b/chrome/browser/notifications/message_center_settings_controller.cc
@@ -142,7 +142,7 @@ MessageCenterSettingsController::MessageCenterSettingsController(
 #if defined(OS_CHROMEOS)
   // UserManager may not exist in some tests.
   if (chromeos::UserManager::IsInitialized())
-    chromeos::UserManager::Get()->AddSessionStateObserver(this);
+    chromeos::GetUserManager()->AddSessionStateObserver(this);
 #endif
 }
 
@@ -150,7 +150,7 @@ MessageCenterSettingsController::~MessageCenterSettingsController() {
 #if defined(OS_CHROMEOS)
   // UserManager may not exist in some tests.
   if (chromeos::UserManager::IsInitialized())
-    chromeos::UserManager::Get()->RemoveSessionStateObserver(this);
+    chromeos::GetUserManager()->RemoveSessionStateObserver(this);
 #endif
 }
 
@@ -451,7 +451,7 @@ void MessageCenterSettingsController::CreateNotifierGroupForGuestLogin() {
   if (!notifier_groups_.empty())
     return;
 
-  chromeos::UserManager* user_manager = chromeos::UserManager::Get();
+  chromeos::UserManager* user_manager = chromeos::GetUserManager();
   // |notifier_groups_| can be empty in login screen too.
   if (!user_manager->IsLoggedInAsGuest())
     return;
@@ -493,7 +493,7 @@ void MessageCenterSettingsController::RebuildNotifierGroups() {
     // Allows the active user only.
     // UserManager may not exist in some tests.
     if (chromeos::UserManager::IsInitialized()) {
-      chromeos::UserManager* user_manager = chromeos::UserManager::Get();
+      chromeos::UserManager* user_manager = chromeos::GetUserManager();
       if (chromeos::ProfileHelper::Get()->GetUserByProfile(group->profile()) !=
           user_manager->GetActiveUser()) {
         continue;
@@ -513,7 +513,7 @@ void MessageCenterSettingsController::RebuildNotifierGroups() {
   // ChromeOS guest login cannot get the profile from the for-loop above, so
   // get the group here.
   if (notifier_groups_.empty() && chromeos::UserManager::IsInitialized() &&
-      chromeos::UserManager::Get()->IsLoggedInAsGuest()) {
+      chromeos::GetUserManager()->IsLoggedInAsGuest()) {
     // Do not invoke CreateNotifierGroupForGuestLogin() directly. In some tests,
     // this method may be called before the primary profile is created, which
     // means ProfileHelper::Get()->GetProfileByUser() will create a new primary