Revert of Introduce sys_sigprocmask and sys_sigaction.

sandbox/linux/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/features.gni")
 import("//testing/test.gni")
 
 declare_args() {
   compile_suid_client = is_linux
 
@@ skipping 270 matching lines @@
       "services/namespace_utils.cc",
       "services/namespace_utils.h",
     ]
 
     deps += [ ":sandbox_services_headers" ]
   }
 }
 
 source_set("sandbox_services_headers") {
   sources = [
+    "system_headers/android_arm64_ucontext.h",
+    "system_headers/android_arm_ucontext.h",
+    "system_headers/android_i386_ucontext.h",
+    "system_headers/android_ucontext.h",
     "system_headers/arm64_linux_syscalls.h",
-    "system_headers/arm64_linux_ucontext.h",
     "system_headers/arm_linux_syscalls.h",
-    "system_headers/arm_linux_ucontext.h",
-    "system_headers/i386_linux_ucontext.h",
     "system_headers/linux_futex.h",
     "system_headers/linux_seccomp.h",
-    "system_headers/linux_signal.h",
     "system_headers/linux_syscalls.h",
-    "system_headers/linux_ucontext.h",
     "system_headers/x86_32_linux_syscalls.h",
     "system_headers/x86_64_linux_syscalls.h",
   ]
 }
 
 # We make this its own target so that it does not interfere with our tests.
 source_set("libc_urandom_override") {
   sources = [
     "services/libc_urandom_override.cc",
     "services/libc_urandom_override.h",
@@ skipping 47 matching lines @@
   #      'type': 'none',
   #      'variables': {
   #        'test_suite_name': 'sandbox_linux_jni_unittests',
   #      },
   #      'dependencies': [
   #        'sandbox_linux_jni_unittests',
   #      ],
   #      'includes': [ '../../build/apk_test.gypi' ],
   #      }
 }