Remove Ash shelf dimmer.

ash/common/shelf/overflow_button.cc

 // Copyright 2013 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/overflow_button.h"
 
 #include "ash/common/ash_constants.h"
 #include "ash/common/material_design/material_design_controller.h"
 #include "ash/common/shelf/ink_drop_button_listener.h"
 #include "ash/common/shelf/shelf_constants.h"
@@ skipping 148 matching lines @@
   }
 
   canvas->DrawImageInt(*image,
                        bounds.x() + ((bounds.width() - image->width()) / 2),
                        bounds.y() + ((bounds.height() - image->height()) / 2));
 }
 
 int OverflowButton::NonMaterialBackgroundImageId() const {
   if (shelf_view_->IsShowingOverflowBubble())
     return IDR_AURA_NOTIFICATION_BACKGROUND_PRESSED;
-  else if (wm_shelf_->IsDimmed())
-    return IDR_AURA_NOTIFICATION_BACKGROUND_ON_BLACK;
   return IDR_AURA_NOTIFICATION_BACKGROUND_NORMAL;
 }
 
 gfx::Rect OverflowButton::CalculateButtonBounds() const {
   ShelfAlignment alignment = wm_shelf_->GetAlignment();
   gfx::Rect bounds(GetContentsBounds());
   ResourceBundle& rb = ResourceBundle::GetSharedInstance();
   if (MaterialDesignController::IsShelfMaterial()) {
     const int width_offset = (bounds.width() - kOverflowButtonSize) / 2;
     const int height_offset = (bounds.height() - kOverflowButtonSize) / 2;
@@ skipping 21 matching lines @@
       bounds =
           gfx::Rect(bounds.x() + (bounds.width() - background->width()) / 2,
                     bounds.y() + kShelfItemInset, background->width(),
                     background->height());
     }
   }
   return bounds;
 }
 
 }  // namespace ash