Remove Ash shelf dimmer.

ash/common/shelf/shelf_layout_manager.cc

 // Copyright (c) 2012 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/common/shelf/shelf_layout_manager.h"
 
 #include <algorithm>
 #include <cmath>
 #include <vector>
 
@@ skipping 489 matching lines @@
 
   if (delay_background_change) {
     if (update_shelf_observer_)
       update_shelf_observer_->Detach();
     // UpdateShelfBackground deletes itself when the animation is done.
     update_shelf_observer_ = new UpdateShelfObserver(this);
   } else {
     UpdateShelfBackground(change_type);
   }
 
-  shelf_widget_->SetDimsShelf(state.visibility_state == SHELF_VISIBLE &&
-                              state.window_state ==
-                                  wm::WORKSPACE_WINDOW_STATE_MAXIMIZED);
-
   TargetBounds target_bounds;
   CalculateTargetBounds(state_, &target_bounds);
   UpdateBoundsAndOpacity(
       target_bounds, true /* animate */, true /* change_work_area */,
       delay_background_change ? update_shelf_observer_ : NULL);
 
   // OnAutoHideStateChanged Should be emitted when:
   //  - firstly state changed to auto-hide from other state
   //  - or, auto_hide_state has changed
   if ((old_state.visibility_state != state_.visibility_state &&
@@ skipping 579 matching lines @@
   gesture_drag_status_ = GESTURE_DRAG_NONE;
 }
 
 void ShelfLayoutManager::CancelGestureDrag() {
   gesture_drag_status_ = GESTURE_DRAG_CANCEL_IN_PROGRESS;
   UpdateVisibilityState();
   gesture_drag_status_ = GESTURE_DRAG_NONE;
 }
 
 }  // namespace ash