chromeos: Rename ash::WmShelf to Shelf

ash/dip_unittest.cc

Index: ash/dip_unittest.cc
diff --git a/ash/dip_unittest.cc b/ash/dip_unittest.cc
index 39cd8170faf23b3090129a4183479b704f26a98a..b3caac68d3aa7077994366947384d194d198ceb3 100644
--- a/ash/dip_unittest.cc
+++ b/ash/dip_unittest.cc
@@ -5,8 +5,8 @@
 #include <algorithm>
 #include <vector>
 
+#include "ash/shelf/shelf.h"
 #include "ash/shelf/shelf_widget.h"
-#include "ash/shelf/wm_shelf.h"
 #include "ash/shell.h"
 #include "ash/test/ash_test_base.h"
 #include "ash/wm/window_properties.h"
@@ -62,7 +62,7 @@ TEST_F(DIPTest, WorkArea) {
 
   // Sanity check if the workarea's inset hight is same as
   // the shelf's height.
-  WmShelf* shelf = GetPrimaryShelf();
+  Shelf* shelf = GetPrimaryShelf();
   EXPECT_EQ(display_2x.bounds().InsetsFrom(work_area).height(),
             shelf->shelf_widget()->GetNativeView()->layer()->bounds().height());
 }