Migrate simple ash Shell metrics users.

ash/wm/panels/panel_window_event_handler.cc

Index: ash/wm/panels/panel_window_event_handler.cc
diff --git a/ash/wm/panels/panel_window_event_handler.cc b/ash/wm/panels/panel_window_event_handler.cc
index 6dfab047cd23db72e0df8de9e3156621da4fb142..784533e535acd5d8c2e8b9a2c294a36b44995b3a 100644
--- a/ash/wm/panels/panel_window_event_handler.cc
+++ b/ash/wm/panels/panel_window_event_handler.cc
@@ -5,8 +5,7 @@
 #include "ash/wm/panels/panel_window_event_handler.h"
 
 #include "ash/common/wm/window_state.h"
-#include "ash/metrics/user_metrics_recorder.h"
-#include "ash/shell.h"
+#include "ash/common/wm_shell.h"
 #include "ash/wm/window_state_aura.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_delegate.h"
@@ -15,11 +14,9 @@
 
 namespace ash {
 
-PanelWindowEventHandler::PanelWindowEventHandler() {
-}
+PanelWindowEventHandler::PanelWindowEventHandler() {}
 
-PanelWindowEventHandler::~PanelWindowEventHandler() {
-}
+PanelWindowEventHandler::~PanelWindowEventHandler() {}
 
 void PanelWindowEventHandler::OnMouseEvent(ui::MouseEvent* event) {
   aura::Window* target = static_cast<aura::Window*>(event->target());
@@ -29,8 +26,7 @@ void PanelWindowEventHandler::OnMouseEvent(ui::MouseEvent* event) {
       event->IsOnlyLeftMouseButton() &&
       target->delegate()->GetNonClientComponent(event->location()) ==
           HTCAPTION) {
-    ash::Shell::GetInstance()->metrics()->RecordUserMetricsAction(
-        ash::UMA_PANEL_MINIMIZE_CAPTION_CLICK);
+    WmShell::Get()->RecordUserMetricsAction(UMA_PANEL_MINIMIZE_CAPTION_CLICK);
     wm::GetWindowState(target)->Minimize();
     event->StopPropagation();
     return;
@@ -44,8 +40,7 @@ void PanelWindowEventHandler::OnGestureEvent(ui::GestureEvent* event) {
       event->details().tap_count() == 2 &&
       target->delegate()->GetNonClientComponent(event->location()) ==
           HTCAPTION) {
-    ash::Shell::GetInstance()->metrics()->RecordUserMetricsAction(
-        ash::UMA_PANEL_MINIMIZE_CAPTION_GESTURE);
+    WmShell::Get()->RecordUserMetricsAction(UMA_PANEL_MINIMIZE_CAPTION_GESTURE);
     wm::GetWindowState(target)->Minimize();
     event->StopPropagation();
     return;