Remove OS_CHROMEOS from ui/ash code

chrome/browser/ui/ash/multi_user/multi_user_window_manager.cc

Index: chrome/browser/ui/ash/multi_user/multi_user_window_manager.cc
diff --git a/chrome/browser/ui/ash/multi_user/multi_user_window_manager.cc b/chrome/browser/ui/ash/multi_user/multi_user_window_manager.cc
index b2b51bee4de813145b64e11fd4e05b1016fa5c23..8cbffb22d7f9885ef0e4c39d018bcd340cc8ff26 100644
--- a/chrome/browser/ui/ash/multi_user/multi_user_window_manager.cc
+++ b/chrome/browser/ui/ash/multi_user/multi_user_window_manager.cc
@@ -4,20 +4,17 @@
 
 #include "chrome/browser/ui/ash/multi_user/multi_user_window_manager.h"
 
-#include "base/logging.h"
-#include "build/build_config.h"
-#include "chrome/browser/ui/ash/multi_user/multi_user_window_manager_stub.h"
-
-#if defined(OS_CHROMEOS)
 #include "ash/ash_switches.h"
 #include "ash/multi_profile_uma.h"
 #include "ash/session/session_state_delegate.h"
 #include "ash/shell.h"
 #include "ash/shell_delegate.h"
+#include "base/logging.h"
+#include "build/build_config.h"
 #include "chrome/browser/ui/ash/multi_user/multi_user_window_manager_chromeos.h"
+#include "chrome/browser/ui/ash/multi_user/multi_user_window_manager_stub.h"
 #include "components/signin/core/account_id/account_id.h"
 #include "components/user_manager/user_info.h"
-#endif
 
 namespace {
 chrome::MultiUserWindowManager* g_instance = NULL;
@@ -39,7 +36,6 @@ MultiUserWindowManager* MultiUserWindowManager::GetInstance() {
 MultiUserWindowManager* MultiUserWindowManager::CreateInstance() {
   DCHECK(!g_instance);
   multi_user_mode_ = MULTI_PROFILE_MODE_OFF;
-#if defined(OS_CHROMEOS)
   ash::MultiProfileUMA::SessionMode mode =
       ash::MultiProfileUMA::SESSION_SINGLE_USER_MODE;
   if (!g_instance &&
@@ -60,7 +56,7 @@ MultiUserWindowManager* MultiUserWindowManager::CreateInstance() {
     mode = ash::MultiProfileUMA::SESSION_SIDE_BY_SIDE_MODE;
   }
   ash::MultiProfileUMA::RecordSessionMode(mode);
-#endif
+
   // If there was no instance created yet we create a dummy instance.
   if (!g_instance)
     g_instance = new MultiUserWindowManagerStub();