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

third_party/tcmalloc/chromium/src/span.cc

 // Copyright (c) 2008, 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 71 matching lines @@
 }
 
 int DLL_Length(const Span* list) {
   int result = 0;
   for (Span* s = list->next; s != list; s = s->next) {
     result++;
   }
   return result;
 }
 
-#if 0  // This isn't used.  If that changes, rewrite to use TCMalloc_Printer.
-void DLL_Print(const char* label, const Span* list) {
-  MESSAGE("%-10s %p:", label, list);
-  for (const Span* s = list->next; s != list; s = s->next) {
-    MESSAGE(" <%p,%"PRIuPTR",%"PRIuPTR">", s, s->start, s->length);
-  }
-  MESSAGE("%s\n", "");  // %s is to get around a compiler error.
-}
-#endif
-
 void DLL_Prepend(Span* list, Span* span) {
   ASSERT(span->next == NULL);
   ASSERT(span->prev == NULL);
   span->next = list->next;
   span->prev = list;
   list->next->prev = span;
   list->next = span;
 }
 
 }  // namespace tcmalloc