Update the tcmalloc vendor branch to r144 (gperftools 2.0), and README.chromium.

third_party/tcmalloc/vendor/src/tests/malloc_hook_test.cc

 // Copyright (c) 2011, 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 24 matching lines @@
 #include <stdio.h>
 #ifdef HAVE_MMAP
 #include <sys/mman.h>
 #endif
 #ifdef HAVE_UNISTD_H
 #include <unistd.h>    // for sleep()
 #endif
 #include <algorithm>
 #include <string>
 #include <vector>
-#include <google/malloc_hook.h>
+#include <gperftools/malloc_hook.h>
 #include "malloc_hook-inl.h"
 #include "base/logging.h"
 #include "base/simple_mutex.h"
 #include "base/sysinfo.h"
 #include "tests/testutil.h"
 
 // On systems (like freebsd) that don't define MAP_ANONYMOUS, use the old
 // form of the name instead.
 #ifndef MAP_ANONYMOUS
 # define MAP_ANONYMOUS MAP_ANON
@@ skipping 301 matching lines @@
   // whoever owns that memory now.
   // EXPECT_DEATH(*ptr = 'a', "SIGSEGV");
 }
 #endif  // #ifdef HAVE_MMAP && linux && ...
 
 }  // namespace
 
 int main(int argc, char** argv) {
   return RUN_ALL_TESTS();
 }