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

ui/app_list/views/search_box_view.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 "ui/app_list/views/search_box_view.h"
 
 #include <algorithm>
 
 #include "grit/ui_resources.h"
 #include "ui/app_list/app_list_model.h"
 #include "ui/app_list/search_box_model.h"
 #include "ui/app_list/views/app_list_menu_views.h"
 #include "ui/app_list/views/search_box_view_delegate.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/events/event.h"
 #include "ui/views/controls/button/menu_button.h"
 #include "ui/views/controls/image_view.h"
 #include "ui/views/controls/textfield/textfield.h"
 
 namespace app_list {
 
 namespace {
 
 const int kPadding = 14;
 const int kIconDimension = 32;
 const int kPreferredWidth = 360;
 const int kPreferredHeight = 48;
+#if !defined(OS_CHROMEOS)
 const int kMenuButtonDimension = 29;
+#endif
 
 const SkColor kHintTextColor = SkColorSetRGB(0xA0, 0xA0, 0xA0);
 
 // Menu offset relative to the bottom-right corner of the menu button.
 const int kMenuYOffsetFromButton = -4;
 const int kMenuXOffsetFromButton = -7;
 
 }  // namespace
 
 SearchBoxView::SearchBoxView(SearchBoxViewDelegate* delegate,
@@ skipping 140 matching lines @@
 void SearchBoxView::SelectionModelChanged() {
   search_box_->SelectSelectionModel(model_->search_box()->selection_model());
 }
 
 void SearchBoxView::TextChanged() {
   search_box_->SetText(model_->search_box()->text());
   NotifyQueryChanged();
 }
 
 }  // namespace app_list