Make chrome/browser/ui/webui not depend on ash when using Athena

chrome/browser/ui/webui/chromeos/set_time_ui.cc

Index: chrome/browser/ui/webui/chromeos/set_time_ui.cc
diff --git a/chrome/browser/ui/webui/chromeos/set_time_ui.cc b/chrome/browser/ui/webui/chromeos/set_time_ui.cc
index 0b377e9a6046bd3d931b15a91c56be0b47cee149..f3b6949bcf6728add3d5f2a8f833bf0f402f8833 100644
--- a/chrome/browser/ui/webui/chromeos/set_time_ui.cc
+++ b/chrome/browser/ui/webui/chromeos/set_time_ui.cc
@@ -4,9 +4,6 @@
 
 #include "chrome/browser/ui/webui/chromeos/set_time_ui.h"
 
-#include "ash/shell.h"
-#include "ash/system/tray/system_tray_delegate.h"
-#include "ash/system/user/login_status.h"
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/build_time.h"
@@ -24,6 +21,12 @@
 #include "content/public/browser/web_ui_message_handler.h"
 #include "grit/browser_resources.h"
 
+#if defined(USE_ASH)
+#include "ash/shell.h"
+#include "ash/system/tray/system_tray_delegate.h"
+#include "ash/system/user/login_status.h"
+#endif
+
 namespace chromeos {
 
 namespace {
@@ -122,10 +125,12 @@ SetTimeUI::SetTimeUI(content::WebUI* web_ui) : WebDialogUI(web_ui) {
   // If we are not logged in, we need to show the time zone dropdown.
   // Otherwise, we can leave |currentTimezoneId| blank.
   std::string current_timezone_id;
+#if defined(USE_ASH)
   if (ash::Shell::GetInstance()->system_tray_delegate()->GetUserLoginStatus() ==
       ash::user::LOGGED_IN_NONE) {
     CrosSettings::Get()->GetString(kSystemTimezone, &current_timezone_id);
   }
+#endif
   values.SetString("currentTimezoneId", current_timezone_id);
   values.SetDouble("buildTime", base::GetBuildTime().ToJsTime());