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

chrome/browser/ui/views/panels/panel_frame_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 "chrome/browser/ui/views/panels/panel_frame_view.h"
 
 #include "chrome/browser/ui/panels/panel.h"
 #include "chrome/browser/ui/panels/panel_constants.h"
 #include "chrome/browser/ui/views/panels/panel_view.h"
 #include "chrome/browser/ui/views/tab_icon_view.h"
@@ skipping 40 matching lines @@
 const int kExtraPaddingBetweenButtonAndTop = 1;
 
 // Colors used to draw titlebar background under default theme.
 const SkColor kActiveBackgroundDefaultColor = SkColorSetRGB(0x3a, 0x3d, 0x3d);
 const SkColor kInactiveBackgroundDefaultColor = SkColorSetRGB(0x7a, 0x7c, 0x7c);
 const SkColor kAttentionBackgroundDefaultColor =
     SkColorSetRGB(0x53, 0xa9, 0x3f);
 
 // Color used to draw the minimized panel.
 const SkColor kMinimizeBackgroundDefaultColor = SkColorSetRGB(0xf5, 0xf4, 0xf0);
-const SkColor kMinimizeBorderDefaultColor = SkColorSetRGB(0xc9, 0xc9, 0xc9);
 
 // Color used to draw the title text under default theme.
 const SkColor kTitleTextDefaultColor = SkColorSetRGB(0xf9, 0xf9, 0xf9);
 
 gfx::ImageSkia* CreateImageForColor(SkColor color) {
   gfx::Canvas canvas(gfx::Size(1, 1), 1.0f, true);
   canvas.DrawColor(color);
   return new gfx::ImageSkia(canvas.ExtractImageRep());
 }
 
@@ skipping 689 matching lines @@
 
   // Draw the left border.
   canvas->TileImageInt(left_image,
                        0,
                        top_left_image.height(),
                        left_image.width(),
                        height() - top_left_image.height() -
                            bottom_left_image.height());
 #endif
 }