Fix r475187 which is a bad revert.

ash/wm/maximize_mode/maximize_mode_window_state.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/wm/maximize_mode/maximize_mode_window_state.h"
 
 #include <utility>
 
 #include "ash/public/cpp/shell_window_ids.h"
 #include "ash/screen_util.h"
@@ skipping 289 matching lines @@
     UpdateBounds(window_state, animated);
   }
 
   window_state->NotifyPostStateTypeChange(old_state_type);
 
   if (old_state_type == wm::WINDOW_STATE_TYPE_PINNED ||
       target_state == wm::WINDOW_STATE_TYPE_PINNED ||
       old_state_type == wm::WINDOW_STATE_TYPE_TRUSTED_PINNED ||
       target_state == wm::WINDOW_STATE_TYPE_TRUSTED_PINNED) {
     Shell::Get()->screen_pinning_controller()->SetPinnedWindow(
-        WmWindow::Get(window_state->window()));
+        window_state->window());
   }
 
   if ((window_state->window()->layer()->GetTargetVisibility() ||
        old_state_type == wm::WINDOW_STATE_TYPE_MINIMIZED) &&
       !window_state->window()->layer()->visible()) {
     // The layer may be hidden if the window was previously minimized. Make
     // sure it's visible.
     window_state->window()->Show();
   }
 }
@@ skipping 21 matching lines @@
       // avoid flashing.
       if (window_state->IsMaximized())
         window_state->SetBoundsDirectCrossFade(bounds_in_parent);
       else
         window_state->SetBoundsDirectAnimated(bounds_in_parent);
     }
   }
 }
 
 }  // namespace ash