mash: Move ash/common/wm/shelf to ash/common/shelf

ash/wm/workspace_controller_unittest.cc

Index: ash/wm/workspace_controller_unittest.cc
diff --git a/ash/wm/workspace_controller_unittest.cc b/ash/wm/workspace_controller_unittest.cc
index e690df18a78afe953be81e44f112ff2799b0580a..38c597e2b81d19efbd2ddd47d4220f766925ebd8 100644
--- a/ash/wm/workspace_controller_unittest.cc
+++ b/ash/wm/workspace_controller_unittest.cc
@@ -511,13 +511,12 @@ TEST_F(WorkspaceControllerTest, MinimizeResetsVisibility) {
   w1->Show();
   wm::ActivateWindow(w1.get());
   w1->SetProperty(aura::client::kShowStateKey, ui::SHOW_STATE_MAXIMIZED);
-  EXPECT_EQ(wm::SHELF_BACKGROUND_MAXIMIZED,
-            shelf_widget()->GetBackgroundType());
+  EXPECT_EQ(SHELF_BACKGROUND_MAXIMIZED, shelf_widget()->GetBackgroundType());
 
   w1->SetProperty(aura::client::kShowStateKey, ui::SHOW_STATE_MINIMIZED);
   Shelf* shelf = Shelf::ForPrimaryDisplay();
   EXPECT_EQ(SHELF_VISIBLE, shelf->GetVisibilityState());
-  EXPECT_EQ(wm::SHELF_BACKGROUND_DEFAULT, shelf_widget()->GetBackgroundType());
+  EXPECT_EQ(SHELF_BACKGROUND_DEFAULT, shelf_widget()->GetBackgroundType());
 }
 
 // Verifies window visibility during various workspace changes.