Refactor: Shelf Widget

ash/wm/panel_layout_manager.cc

Index: ash/wm/panel_layout_manager.cc
diff --git a/ash/wm/panel_layout_manager.cc b/ash/wm/panel_layout_manager.cc
index 54df0c29dae1efc4c3df52235e44e363ed2040d0..60e47ef8f432d1fb6f0e685e70b00e8102e0f4c0 100644
--- a/ash/wm/panel_layout_manager.cc
+++ b/ash/wm/panel_layout_manager.cc
@@ -9,6 +9,7 @@
 
 #include "ash/launcher/launcher.h"
 #include "ash/screen_ash.h"
+#include "ash/shelf/shelf_widget.h"
 #include "ash/shell.h"
 #include "ash/wm/frame_painter.h"
 #include "ash/wm/property_util.h"
@@ -136,8 +137,6 @@ PanelLayoutManager::PanelLayoutManager(aura::Window* panel_container)
 
 PanelLayoutManager::~PanelLayoutManager() {
   Shutdown();
-  if (launcher_)
-    launcher_->RemoveIconObserver(this);
   aura::client::GetActivationClient(Shell::GetPrimaryRootWindow())->
       RemoveObserver(this);
 }
@@ -148,6 +147,9 @@ void PanelLayoutManager::Shutdown() {
     delete iter->callout_widget;
   }
   panel_windows_.clear();
+  if (launcher_)
+    launcher_->RemoveIconObserver(this);
+  launcher_ = NULL;
 }
 
 void PanelLayoutManager::StartDragging(aura::Window* panel) {
@@ -322,14 +324,14 @@ void PanelLayoutManager::RestorePanel(aura::Window* panel) {
 }
 
 void PanelLayoutManager::Relayout() {
-  if (!launcher_ || !launcher_->widget())
+  if (!launcher_ || !launcher_->shelf_widget())
     return;
 
   if (in_layout_)
     return;
   base::AutoReset<bool> auto_reset_in_layout(&in_layout_, true);
 
-  int launcher_top = launcher_->widget()->GetWindowBoundsInScreen().y();
+  int launcher_top = launcher_->shelf_widget()->GetWindowBoundsInScreen().y();
   int panel_left_bounds = kPanelIdealSpacing;
   int panel_right_bounds =
       panel_container_->bounds().width() - kPanelIdealSpacing;