GTTF: Enable glibcxx debug mode for Debug builds by default.

ui/gfx/image/image_family.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/gfx/image/image_family.h"
 
 #include <cmath>
 
 #include "ui/gfx/image/image.h"
 #include "ui/gfx/image/image_skia.h"
 #include "ui/gfx/size.h"
 
 namespace gfx {
 
 ImageFamily::const_iterator::const_iterator() {}
 
 ImageFamily::const_iterator::const_iterator(const const_iterator& other)
     : map_iterator_(other.map_iterator_) {}
 
 ImageFamily::const_iterator::const_iterator(
     const std::map<MapKey, gfx::Image>::const_iterator& other)
     : map_iterator_(other) {}
 
+ImageFamily::const_iterator::~const_iterator() {}
+
 ImageFamily::ImageFamily() {}
 ImageFamily::~ImageFamily() {}
 
 void ImageFamily::Add(const gfx::Image& image) {
   gfx::Size size = image.Size();
   if (size.IsEmpty()) {
     map_[MapKey(1.0f, 0)] = image;
   } else {
     float aspect = static_cast<float>(size.width()) / size.height();
     DCHECK_GT(aspect, 0.0f);
@@ skipping 85 matching lines @@
   DCHECK(greater_or_equal != map_.begin());
   std::map<MapKey, gfx::Image>::const_iterator less_than = greater_or_equal;
   --less_than;
   // This must be true because there must be at least one image with |aspect|.
   DCHECK_EQ(less_than->first.aspect(), aspect);
   // We have found the largest image smaller than desired.
   return &less_than->second;
 }
 
 }  // namespace gfx