Use mojo SystemTray interfaces for both mash and classic ash

chrome/browser/ui/ash/system_tray_client.cc

Index: chrome/browser/ui/ash/system_tray_client.cc
diff --git a/chrome/browser/ui/ash/system_tray_client.cc b/chrome/browser/ui/ash/system_tray_client.cc
index df8c5e0b1578c95c8197fde50f23316bbdc9fd15..1ecaea3a98dbaa785aa8361b5e37e2c8b0ecb993 100644
--- a/chrome/browser/ui/ash/system_tray_client.cc
+++ b/chrome/browser/ui/ash/system_tray_client.cc
@@ -9,9 +9,15 @@
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/browser_process_platform_part.h"
 #include "chrome/browser/chromeos/system/system_clock.h"
+#include "chrome/browser/profiles/profile_manager.h"
+#include "chrome/browser/ui/chrome_pages.h"
 #include "chrome/browser/ui/ash/system_tray_common.h"
+#include "chrome/common/url_constants.h"
+#include "chrome/grit/generated_resources.h"
 #include "content/public/common/mojo_shell_connection.h"
 #include "services/shell/public/cpp/connector.h"
+#include "content/public/browser/user_metrics.h"
+#include "ui/base/l10n/l10n_util.h"
 
 namespace {
 
@@ -65,7 +71,14 @@ void SystemTrayClient::ShowSettings() {
 }
 
 void SystemTrayClient::ShowDateSettings() {
-  SystemTrayCommon::ShowDateSettings();
+  // REVIEWERS: SystemTrayCommon is not needed with this approach.
+  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);
 }
 
 void SystemTrayClient::ShowDisplaySettings() {