Use mojo SystemTray interfaces for both mash and classic ash

chrome/browser/ui/ash/system_tray_common.cc

Index: chrome/browser/ui/ash/system_tray_common.cc
diff --git a/chrome/browser/ui/ash/system_tray_common.cc b/chrome/browser/ui/ash/system_tray_common.cc
index c869c3f39001bee2f9f3f3be1d5b91316b4a35e4..0edfa536c1d4250f5120f63a56eb5557651964ff 100644
--- a/chrome/browser/ui/ash/system_tray_common.cc
+++ b/chrome/browser/ui/ash/system_tray_common.cc
@@ -41,17 +41,6 @@ void SystemTrayCommon::ShowSettings() {
 }
 
 // static
-void SystemTrayCommon::ShowDateSettings() {
-  content::RecordAction(base::UserMetricsAction("ShowDateOptions"));
-  std::string sub_page =
-      std::string(chrome::kSearchSubPage) + "#" +
-      l10n_util::GetStringUTF8(IDS_OPTIONS_SETTINGS_SECTION_TITLE_DATETIME);
-  // Everybody can change the time zone (even though it is a device setting).
-  chrome::ShowSettingsSubPageForProfile(ProfileManager::GetActiveUserProfile(),
-                                        sub_page);
-}
-
-// static
 void SystemTrayCommon::ShowDisplaySettings() {
   content::RecordAction(base::UserMetricsAction("ShowDisplayOptions"));
   ShowSettingsSubPageForActiveUser(kDisplaySettingsSubPageName);