[mus+ash] Removes WmWindow from window_positioning_utils

ash/wm/window_util_unittest.cc

Index: ash/wm/window_util_unittest.cc
diff --git a/ash/wm/window_util_unittest.cc b/ash/wm/window_util_unittest.cc
index bef1741d4b96c98d11fea13508be426693ae8f68..97f4796d8e7d8b2c260ec798ee3028450ce5d008 100644
--- a/ash/wm/window_util_unittest.cc
+++ b/ash/wm/window_util_unittest.cc
@@ -34,13 +34,13 @@ TEST_F(WindowUtilTest, CenterWindow) {
   WindowState* window_state = GetWindowState(window.get());
   EXPECT_FALSE(window_state->bounds_changed_by_user());
 
-  CenterWindow(WmWindow::Get(window.get()));
+  CenterWindow(window.get());
   // Centring window is considered as a user's action.
   EXPECT_TRUE(window_state->bounds_changed_by_user());
   EXPECT_EQ("200,126 100x100", window->bounds().ToString());
   EXPECT_EQ("200,126 100x100", window->GetBoundsInScreen().ToString());
   window->SetBoundsInScreen(gfx::Rect(600, 0, 100, 100), GetSecondaryDisplay());
-  CenterWindow(WmWindow::Get(window.get()));
+  CenterWindow(window.get());
   EXPECT_EQ("250,126 100x100", window->bounds().ToString());
   EXPECT_EQ("750,126 100x100", window->GetBoundsInScreen().ToString());
 }