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

ui/message_center/views/bounded_label.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 "ui/message_center/views/bounded_label.h"
 
 #include <limits>
 
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/text_elider.h"
 #include "ui/views/controls/label.h"
 
 namespace {
 
 const size_t kPreferredLinesCacheSize = 10;
-const size_t kPreferredSizeCacheSize = 10;
 
 }  // namespace
 
 namespace message_center {
 
 // InnerBoundedLabel ///////////////////////////////////////////////////////////
 
 // InnerBoundedLabel is a views::Label subclass that does all of the work for
 // BoundedLabel. It is kept private to prevent outside code from calling a
 // number of views::Label methods like setFont() that break BoundedLabel's
@@ skipping 309 matching lines @@
 
 void BoundedLabel::OnNativeThemeChanged(const ui::NativeTheme* theme) {
   label_->SetNativeTheme(theme);
 }
 
 string16 BoundedLabel::GetWrappedTextForTest(int width, int lines) {
   return JoinString(label_->GetWrappedText(width, lines), '\n');
 }
 
 }  // namespace message_center