seccomp: remove build-time flags

build/common.gypi

 # Copyright (c) 2010 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.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   'variables': {
     # .gyp files or targets should set chromium_code to 1 if they build
@@ skipping 1105 matching lines @@
           }],
           ['no_strict_aliasing==1', {
             'cflags': [
               '-fno-strict-aliasing',
             ],
           }],
           ['linux_breakpad==1', {
             'cflags': [ '-g' ],
             'defines': ['USE_LINUX_BREAKPAD'],
           }],
-          ['linux_use_seccomp_sandbox==1 and buildtype!="Official"', {
-            'defines': ['USE_SECCOMP_SANDBOX'],
-          }],
           ['library=="shared_library"', {
             # When building with shared libraries, remove the visiblity-hiding
             # flag.
             'cflags!': [ '-fvisibility=hidden' ],
             'conditions': [
               ['target_arch=="x64" or target_arch=="arm"', {
                 # Shared libraries need -fPIC on x86-64 and arm
                 'cflags': ['-fPIC']
               }]
             ],
@@ skipping 331 matching lines @@
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }
 
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