tcmalloc: Use C++11 atomics where appropriate.

base/allocator/allocator.gyp

 # Copyright (c) 2012 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.
 
 {
   'target_defaults': {
     'variables': {
       # This code gets run a lot and debugged rarely, so it should be fast
       # by default. See http://crbug.com/388949.
       'debug_optimize': '2',
@@ skipping 86 matching lines @@
             '<(tcmalloc_dir)/src/config.h',
             '<(tcmalloc_dir)/src/config_android.h',
             '<(tcmalloc_dir)/src/config_linux.h',
             '<(tcmalloc_dir)/src/config_win.h',
 
             # all tcmalloc native and forked files
             '<(tcmalloc_dir)/src/addressmap-inl.h',
             '<(tcmalloc_dir)/src/base/abort.cc',
             '<(tcmalloc_dir)/src/base/abort.h',
             '<(tcmalloc_dir)/src/base/arm_instruction_set_select.h',
-            '<(tcmalloc_dir)/src/base/atomicops-internals-arm-generic.h',
-            '<(tcmalloc_dir)/src/base/atomicops-internals-arm-v6plus.h',
-            '<(tcmalloc_dir)/src/base/atomicops-internals-linuxppc.h',
             '<(tcmalloc_dir)/src/base/atomicops-internals-macosx.h',
             '<(tcmalloc_dir)/src/base/atomicops-internals-windows.h',
-            '<(tcmalloc_dir)/src/base/atomicops-internals-x86.cc',
-            '<(tcmalloc_dir)/src/base/atomicops-internals-x86.h',
+            '<(tcmalloc_dir)/src/base/atomicops_internals_portable.h',
             '<(tcmalloc_dir)/src/base/atomicops.h',
             '<(tcmalloc_dir)/src/base/basictypes.h',
             '<(tcmalloc_dir)/src/base/commandlineflags.h',
             '<(tcmalloc_dir)/src/base/cycleclock.h',
             # We don't list dynamic_annotations.c since its copy is already
             # present in the dynamic_annotations target.
             '<(tcmalloc_dir)/src/base/dynamic_annotations.h',
             '<(tcmalloc_dir)/src/base/elf_mem_image.cc',
             '<(tcmalloc_dir)/src/base/elf_mem_image.h',
             '<(tcmalloc_dir)/src/base/elfcore.h',
@@ skipping 257 matching lines @@
                 '<(SHARED_INTERMEDIATE_DIR)/allocator',
                 '<(target_arch)',
               ],
             },
           ],
         },
       ],
     }],
   ],
 }