Remove WmLookup.

ash/common/wallpaper/wallpaper_view.cc

Index: ash/common/wallpaper/wallpaper_view.cc
diff --git a/ash/common/wallpaper/wallpaper_view.cc b/ash/common/wallpaper/wallpaper_view.cc
index 85c14e9d272ed0751ad08199209d3fd06c09a69e..2aed6b6f4b11b5917151d17b5ef87c2bed771da7 100644
--- a/ash/common/wallpaper/wallpaper_view.cc
+++ b/ash/common/wallpaper/wallpaper_view.cc
@@ -9,7 +9,6 @@
 #include "ash/common/wallpaper/wallpaper_delegate.h"
 #include "ash/common/wallpaper/wallpaper_widget_controller.h"
 #include "ash/common/wm/overview/window_selector_controller.h"
-#include "ash/common/wm_lookup.h"
 #include "ash/common/wm_shell.h"
 #include "ash/common/wm_window.h"
 #include "ash/root_window_controller.h"
@@ -39,7 +38,7 @@ class LayerControlView : public views::View {
 
   // Overrides views::View.
   void Layout() override {
-    WmWindow* window = WmLookup::Get()->GetWindowForWidget(GetWidget());
+    WmWindow* window = WmWindow::Get(GetWidget()->GetNativeWindow());
     // Keep |this| at the bottom since there may be other windows on top of the
     // wallpaper view such as an overview mode shield.
     window->GetParent()->StackChildAtBottom(window);
@@ -207,7 +206,7 @@ views::Widget* CreateWallpaper(WmWindow* root_window, int container_id) {
   wallpaper_widget->SetContentsView(new LayerControlView(new WallpaperView()));
   int animation_type = wallpaper_delegate->GetAnimationType();
   WmWindow* wallpaper_window =
-      WmLookup::Get()->GetWindowForWidget(wallpaper_widget);
+      WmWindow::Get(wallpaper_widget->GetNativeWindow());
   wallpaper_window->SetVisibilityAnimationType(animation_type);
 
   RootWindowController* root_window_controller =