Remove non-cros support from ash/common/system.

ash/common/system/date/system_info_default_view.h

Index: ash/common/system/date/system_info_default_view.h
diff --git a/ash/common/system/date/system_info_default_view.h b/ash/common/system/date/system_info_default_view.h
index ace777b7f3a39790b92b413641703ce6d581d55f..95fcb010f22370cee5c96b0b6e457722e633302c 100644
--- a/ash/common/system/date/system_info_default_view.h
+++ b/ash/common/system/date/system_info_default_view.h
@@ -11,9 +11,7 @@
 #include "ui/views/view.h"
 
 namespace ash {
-#if defined(OS_CHROMEOS)
 class PowerStatusView;
-#endif  // defined(OS_CHROMEOS)
 class SystemTrayItem;
 class TriView;
 
@@ -48,9 +46,7 @@ class ASH_EXPORT SystemInfoDefaultView : public views::View {
 
   tray::DateView* date_view_;
 
-#if defined(OS_CHROMEOS)
   PowerStatusView* power_status_view_ = nullptr;
-#endif  // defined(OS_CHROMEOS)
 
   TriView* tri_view_;