Make the seccomp sandbox compatible with tcmalloc:...

sandbox/linux/seccomp/maps.h

 // Copyright (c) 2010 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 MAPS_H__
 #define MAPS_H__
 
 #include <elf.h>
 #include <functional>
 #include <map>
@@ skipping 19 matching lines @@
                             SystemAllocator<char> > string;
 
   Maps(int proc_self_maps);
   ~Maps() { }
 
  protected:
   // A map with all the libraries currently loaded into the application.
   // The key is a unique combination of device number, inode number, and
   // file name. It should be treated as opaque.
   typedef std::map<string, Library, std::less<string>,
-                   SystemAllocator<string> > LibraryMap;
+                   SystemAllocator<std::pair<const string,
+                                             Library> > > LibraryMap;
   friend class Iterator;
   class Iterator {
     friend class Maps;
 
    protected:
     explicit Iterator(Maps* maps);
     Iterator(Maps* maps, bool at_beginning, bool at_end);
     Maps::LibraryMap::iterator& getIterator() const;
 
    public:
@@ skipping 33 matching lines @@
   const Iterator begin_iter_;
   const Iterator end_iter_;
 
   LibraryMap     libs_;
   char*          vsyscall_;
 };
 
 } // namespace
 
 #endif // MAPS_H__