chromeos: Rename ash::WmShelf to Shelf

ash/first_run/first_run_helper_impl.cc

Index: ash/first_run/first_run_helper_impl.cc
diff --git a/ash/first_run/first_run_helper_impl.cc b/ash/first_run/first_run_helper_impl.cc
index 4c0a2b3b5a938231f98c3f16032c3935683d1011..b4c5f9e7525bb1b2d084bf6b86fdac0f73f45644 100644
--- a/ash/first_run/first_run_helper_impl.cc
+++ b/ash/first_run/first_run_helper_impl.cc
@@ -6,8 +6,8 @@
 
 #include "ash/public/cpp/shell_window_ids.h"
 #include "ash/shelf/app_list_button.h"
+#include "ash/shelf/shelf.h"
 #include "ash/shelf/shelf_widget.h"
-#include "ash/shelf/wm_shelf.h"
 #include "ash/shell.h"
 #include "ash/system/tray/system_tray.h"
 #include "ash/wm_window.h"
@@ -55,7 +55,7 @@ views::Widget* FirstRunHelperImpl::GetOverlayWidget() {
 }
 
 gfx::Rect FirstRunHelperImpl::GetAppListButtonBounds() {
-  WmShelf* shelf = WmShelf::ForWindow(Shell::GetPrimaryRootWindow());
+  Shelf* shelf = Shelf::ForWindow(Shell::GetPrimaryRootWindow());
   AppListButton* app_button = shelf->shelf_widget()->GetAppListButton();
   return app_button->GetBoundsInScreen();
 }