Start removing some pre-md constants and related code.

ash/common/system/tray/system_tray_item.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/common/system/tray/system_tray_item.h"
 
 #include "ash/common/system/tray/system_tray.h"
 #include "ash/common/system/tray/system_tray_delegate.h"
 #include "ash/common/system/tray/tray_constants.h"
 #include "base/timer/timer.h"
@@ skipping 24 matching lines @@
 
 void SystemTrayItem::DestroyTrayView() {}
 
 void SystemTrayItem::DestroyDefaultView() {}
 
 void SystemTrayItem::DestroyDetailedView() {}
 
 void SystemTrayItem::DestroyNotificationView() {}
 
 void SystemTrayItem::TransitionDetailedView() {
-  const int transition_delay =
-      GetTrayConstant(TRAY_POPUP_TRANSITION_TO_DETAILED_DELAY);
-  if (transition_delay <= 0) {
-    DoTransitionToDetailedView();
-    return;
-  }
-  transition_delay_timer_.reset(new base::OneShotTimer());
-  transition_delay_timer_->Start(
-      FROM_HERE, base::TimeDelta::FromMilliseconds(transition_delay), this,
-      &SystemTrayItem::DoTransitionToDetailedView);
+  transition_delay_timer_.Start(
+      FROM_HERE,
+      base::TimeDelta::FromMilliseconds(kTrayDetailedViewTransitionDelayMs),
+      base::Bind(&SystemTray::ShowDetailedView, base::Unretained(system_tray()),
+                 this, 0, true, BUBBLE_USE_EXISTING));
 }
 
 void SystemTrayItem::UpdateAfterLoginStatusChange(LoginStatus status) {}
 
 void SystemTrayItem::UpdateAfterShelfAlignmentChange(ShelfAlignment alignment) {
 }
 
 void SystemTrayItem::PopupDetailedView(int for_seconds, bool activate) {
   system_tray()->ShowDetailedView(this, for_seconds, activate,
                                   BUBBLE_CREATE_NEW);
@@ skipping 12 matching lines @@
 }
 
 void SystemTrayItem::HideNotificationView() {
   system_tray()->HideNotificationView(this);
 }
 
 bool SystemTrayItem::ShouldShowShelf() const {
   return true;
 }
 
-void SystemTrayItem::DoTransitionToDetailedView() {
-  transition_delay_timer_.reset();
-  system_tray()->ShowDetailedView(this, 0, true, BUBBLE_USE_EXISTING);
-}
-
 }  // namespace ash