Clean up unused constant globals

chrome/browser/ui/gtk/notifications/balloon_view_gtk.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/gtk/notifications/balloon_view_gtk.h"
 
 #include <gtk/gtk.h>
 
 #include <string>
 #include <vector>
@@ skipping 36 matching lines @@
 
 namespace {
 
 // Margin, in pixels, between the notification frame and the contents
 // of the notification.
 const int kTopMargin = 0;
 const int kBottomMargin = 1;
 const int kLeftMargin = 1;
 const int kRightMargin = 1;
 
-// How many pixels of overlap there is between the shelf top and the
-// balloon bottom.
-const int kShelfBorderTopOverlap = 0;
-
 // Properties of the origin label.
 const int kLeftLabelMargin = 8;
 
 // TODO(johnnyg): Add a shadow for the frame.
 const int kLeftShadowWidth = 0;
 const int kRightShadowWidth = 0;
 const int kTopShadowWidth = 0;
 const int kBottomShadowWidth = 0;
 
 // Space in pixels between text and icon on the buttons.
@@ skipping 398 matching lines @@
         base::Bind(
             &BalloonViewImpl::DelayedClose, weak_factory_.GetWeakPtr(), false));
   }
 }
 
 gboolean BalloonViewImpl::OnDestroy(GtkWidget* widget) {
   frame_container_ = NULL;
   Close(false);
   return FALSE;  // Propagate.
 }