chromeos: Rename ash::WmShelf to Shelf

ash/system/palette/palette_utils.cc

Index: ash/system/palette/palette_utils.cc
diff --git a/ash/system/palette/palette_utils.cc b/ash/system/palette/palette_utils.cc
index a26f9065e9f8a37ef318c2de0ddb0072bbe10ed7..b41bc3b655aeb6376ca7ca92bfa0965851c7864c 100644
--- a/ash/system/palette/palette_utils.cc
+++ b/ash/system/palette/palette_utils.cc
@@ -6,7 +6,7 @@
 
 #include "ash/ash_switches.h"
 #include "ash/palette_delegate.h"
-#include "ash/shelf/wm_shelf.h"
+#include "ash/shelf/shelf.h"
 #include "ash/shell.h"
 #include "ash/system/palette/palette_tray.h"
 #include "ash/system/status_area_widget.h"
@@ -55,7 +55,7 @@ bool ShouldShowPalette() {
 bool PaletteContainsPointInScreen(const gfx::Point& point) {
   for (aura::Window* window : Shell::GetAllRootWindows()) {
     PaletteTray* palette_tray =
-        WmShelf::ForWindow(window)->GetStatusAreaWidget()->palette_tray();
+        Shelf::ForWindow(window)->GetStatusAreaWidget()->palette_tray();
     if (palette_tray && palette_tray->ContainsPointInScreen(point))
       return true;
   }