Drop _DEFAULT_SOURCE and _BSD_SOURCE defines

build/common.gypi

 # 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': {
     # .gyp files should set chromium_code to 1 if they build Chromium-specific
     # code, as opposed to external code.  This variable is used to control
     # such things as the set of warnings to enable, and whether warnings are
     # treated as errors.
@@ skipping 418 matching lines @@
         ],
         'cflags_cc': [
           '-fno-rtti',
           '-fno-threadsafe-statics',
         ],
         'ldflags': [
           '-pthread',
           '-Wl,-z,noexecstack',
         ],
         'defines': [
-          '_DEFAULT_SOURCE=1',
-          '_BSD_SOURCE=1',
           '_POSIX_C_SOURCE=199506',
           '_XOPEN_SOURCE=600',
           '_GNU_SOURCE=1',
           '__STDC_LIMIT_MACROS=1',
         ],
         'configurations': {
           'Debug': {
             'variables': {
               'debug_optimize%': '0',
             },
@@ skipping 370 matching lines @@
     # like PROJECT_DERIVED_FILE_DIR is added to a project, in order for the
     # files to appear (when present) in the UI as actual files and not red
     # red "missing file" proxies, the correct path to PROJECT_DERIVED_FILE_DIR,
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
   'includes': [
     'untrusted.gypi',
   ],
 }