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

chrome/common/extensions/extension_set.h

 // 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.
 
 #ifndef CHROME_COMMON_EXTENSIONS_EXTENSION_SET_H_
 #define CHROME_COMMON_EXTENSIONS_EXTENSION_SET_H_
 
 #include <iterator>
 #include <map>
 #include <string>
@@ skipping 16 matching lines @@
 
   // Iteration over the values of the map (given that it's an ExtensionSet,
   // it should iterate like a set iterator).
   class const_iterator :
       public std::iterator<std::input_iterator_tag,
                            scoped_refptr<const extensions::Extension> > {
    public:
     const_iterator();
     const_iterator(const const_iterator& other);
     explicit const_iterator(ExtensionMap::const_iterator it);
+    ~const_iterator();
     const_iterator& operator++() {
       ++it_;
       return *this;
     }
     const_iterator operator++(int) {
       const const_iterator old(*this);
       ++it_;
       return old;
     }
     const scoped_refptr<const extensions::Extension>& operator*() const {
@@ skipping 89 matching lines @@
   // If non-null, called with the extension ids in this set after a modification
   // occurred. This is not called on Clear() which is typically used when
   // discarding the set (e.g., on shutdown) and we do not want to track that as
   // a real modification.
   ModificationCallback modification_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionSet);
 };
 
 #endif  // CHROME_COMMON_EXTENSIONS_EXTENSION_SET_H_