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

third_party/tcmalloc/vendor/src/libc_override_glibc.h

 // 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 22 matching lines @@
 // Used to override malloc routines on systems that are using glibc.
 
 #ifndef TCMALLOC_LIBC_OVERRIDE_GLIBC_INL_H_
 #define TCMALLOC_LIBC_OVERRIDE_GLIBC_INL_H_
 
 #include <config.h>
 #include <features.h>     // for __GLIBC__
 #ifdef HAVE_SYS_CDEFS_H
 #include <sys/cdefs.h>    // for __THROW
 #endif
-#include <google/tcmalloc.h>
+#include <gperftools/tcmalloc.h>
 
 #ifndef __GLIBC__
 # error libc_override_glibc.h is for glibc distributions only.
 #endif
 
 // In glibc, the memory-allocation methods are weak symbols, so we can
 // just override them with our own.  If we're using gcc, we can use
 // __attribute__((alias)) to do the overriding easily (exception:
 // Mach-O, which doesn't support aliases).  Otherwise we have to use a
 // function call.
@@ skipping 85 matching lines @@
     = &glibc_override_free;
 void* (* MALLOC_HOOK_MAYBE_VOLATILE __memalign_hook)(size_t,size_t, const void*)
     = &glibc_override_memalign;
 
 }   // extern "C"
 
 // No need to write ReplaceSystemAlloc(); one of the #includes above
 // did it for us.
 
 #endif  // TCMALLOC_LIBC_OVERRIDE_GLIBC_INL_H_