Adapt upstream patches fixing potential deadlock in tcmalloc after fork.

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 327 matching lines @@
                 '<(tcmalloc_dir)/src/profile-handler.h',
                 '<(tcmalloc_dir)/src/profiledata.cc',
                 '<(tcmalloc_dir)/src/profiledata.h',
                 '<(tcmalloc_dir)/src/profiler.cc',
               ],
             }],
             ['use_experimental_allocator_shim==1', {
               'defines': [
                 'TCMALLOC_DONT_REPLACE_SYSTEM_ALLOC',
               ],
-            }]
+            }],
+            ['OS=="linux"', {
+              'defines': [
+                'HAVE_FORK',
+              ],
+            }],
           ],
           'configurations': {
             'Debug_Base': {
               'conditions': [
                 ['disable_debugallocation==0', {
                   'defines': [
                     # Use debugallocation for Debug builds to catch problems
                     # early and cleanly, http://crbug.com/30715 .
                     'TCMALLOC_FOR_DEBUGALLOCATION',
                   ],
@@ skipping 44 matching lines @@
                 '<(SHARED_INTERMEDIATE_DIR)/allocator',
                 '<(target_arch)',
               ],
             },
           ],
         },
       ],
     }],
   ],
 }