fix warning compiling allocator/tcmalloc on win32

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.
 
 {
   'variables': {
     'jemalloc_dir': '../../third_party/jemalloc/chromium',
     'tcmalloc_dir': '../../third_party/tcmalloc/chromium',
   },
   'targets': [
@@ skipping 286 matching lines @@
               'RuntimeLibrary': '0',
             },
           },
         },
       },
       'conditions': [
         ['OS=="win"', {
           'defines': [
             'PERFTOOLS_DLL_DECL=',
           ],
+          'defines!': [
+            # tcmalloc source files unconditionally define this, remove it from
+            # the list of defines that common.gypi defines globally.
+            'NOMINMAX',
+          ],
           'dependencies': [
             'libcmt',
           ],
           'include_dirs': [
             '<(tcmalloc_dir)/src/windows',
           ],
           'sources!': [
             '<(tcmalloc_dir)/src/base/elf_mem_image.cc',
             '<(tcmalloc_dir)/src/base/elf_mem_image.h',
             '<(tcmalloc_dir)/src/base/linuxthreads.cc',
@@ skipping 183 matching lines @@
           'configurations': {
             'Common_Base': {
               'msvs_target_platform': 'x64',
             },
           },
         },
       ],
     }],
   ],
 }