Update the tcmalloc chromium branch to r144 (gperftools 2.0), and merge chromium-specific changes.

third_party/tcmalloc/chromium/src/base/stl_allocator.h

 /* Copyright (c) 2006, Google Inc.
  * All rights reserved.
  * 
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  * 
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 69 matching lines @@
 
   pointer allocate(size_type n, const void* = 0) {
     RAW_DCHECK((n * sizeof(T)) / sizeof(T) == n, "n is too big to allocate");
     return static_cast<T*>(Alloc::Allocate(n * sizeof(T)));
   }
   void deallocate(pointer p, size_type n) { Alloc::Free(p, n * sizeof(T)); }
 
   size_type max_size() const { return size_t(-1) / sizeof(T); }
 
   void construct(pointer p, const T& val) { ::new(p) T(val); }
+  void construct(pointer p) { ::new(p) T(); }
   void destroy(pointer p) { p->~T(); }
 
   // There's no state, so these allocators are always equal
   bool operator==(const STL_Allocator&) const { return true; }
 };
 
 #endif  // BASE_STL_ALLOCATOR_H_