mash: Add SystemTrayClient interface, use to show date settings

chrome/browser/ui/views/ash/chrome_browser_main_extra_parts_ash.h

Index: chrome/browser/ui/views/ash/chrome_browser_main_extra_parts_ash.h
diff --git a/chrome/browser/ui/views/ash/chrome_browser_main_extra_parts_ash.h b/chrome/browser/ui/views/ash/chrome_browser_main_extra_parts_ash.h
index 4df07cc2195a160282d479c5285d6326081e7f77..0d7f00d511e39b384b81578d84e76f7d1d5247b7 100644
--- a/chrome/browser/ui/views/ash/chrome_browser_main_extra_parts_ash.h
+++ b/chrome/browser/ui/views/ash/chrome_browser_main_extra_parts_ash.h
@@ -12,7 +12,7 @@
 
 class ImmersiveContextMus;
 class ImmersiveHandlerFactoryMus;
-class SystemTrayControllerMus;
+class SystemTrayClient;
 
 class ChromeBrowserMainExtraPartsAsh : public ChromeBrowserMainExtraParts {
  public:
@@ -27,7 +27,7 @@ class ChromeBrowserMainExtraPartsAsh : public ChromeBrowserMainExtraParts {
  private:
   std::unique_ptr<ImmersiveHandlerFactoryMus> immersive_handler_factory_;
   std::unique_ptr<ImmersiveContextMus> immersive_context_;
-  std::unique_ptr<SystemTrayControllerMus> system_tray_controller_;
+  std::unique_ptr<SystemTrayClient> system_tray_client_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeBrowserMainExtraPartsAsh);
 };