linux and chromeos: Turn on -Wunused-const-variable.

ash/launcher/launcher_button.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/launcher/launcher_button.h"
 
 #include <algorithm>
 
 #include "ash/ash_switches.h"
 #include "ash/launcher/launcher_button_host.h"
@@ skipping 11 matching lines @@
 #include "ui/gfx/image/image.h"
 #include "ui/gfx/image/image_skia_operations.h"
 #include "ui/gfx/skbitmap_operations.h"
 #include "ui/views/controls/image_view.h"
 
 namespace {
 
 // Size of the bar. This is along the opposite axis of the shelf. For example,
 // if the shelf is aligned horizontally then this is the height of the bar.
 const int kBarSize = 3;
-const int kBarSpacing = 5;
 const int kIconSize = 32;
 const int kHopSpacing = 2;
 const int kIconPad = 8;
 const int kAlternateIconPad = 5;
 const int kAlternateIconPadVertical = 6;
 const int kHopUpMS = 0;
 const int kHopDownMS = 200;
 const int kAttentionThrobDurationMS = 800;
 
 bool ShouldHop(int state) {
@@ skipping 535 matching lines @@
             views::ImageView::CENTER,
             views::ImageView::LEADING));
     bar_->SchedulePaint();
   }
 
   bar_->SetVisible(bar_id != 0 && state_ != STATE_NORMAL);
 }
 
 }  // namespace internal
 }  // namespace ash