[gn] Improve sharing common configuration

test/unittests/BUILD.gn

 # Copyright 2016 The V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # Please keep this file in sync with unittests.gyp.
 
 import("../../gni/v8.gni")
 
-executable("unittests") {
+v8_executable("unittests") {
   testonly = true
 
   sources = [
     "base/atomic-utils-unittest.cc",
     "base/bits-unittest.cc",
     "base/cpu-unittest.cc",
     "base/division-by-constant-unittest.cc",
     "base/flags-unittest.cc",
     "base/functional-unittest.cc",
     "base/iterator-unittest.cc",
@@ skipping 109 matching lines @@
   } else if (v8_target_arch == "mips64" || v8_target_arch == "mips64el") {
     sources += [ "compiler/mips64/instruction-selector-mips64-unittest.cc" ]
   } else if (v8_target_arch == "x64") {
     sources += [ "compiler/x64/instruction-selector-x64-unittest.cc" ]
   } else if (v8_target_arch == "ppc" || v8_target_arch == "ppc64") {
     sources += [ "compiler/ppc/instruction-selector-ppc-unittest.cc" ]
   } else if (v8_target_arch == "s390" || v8_target_arch == "s390x") {
     sources += [ "compiler/s390/instruction-selector-s390-unittest.cc" ]
   }
 
-  configs -= [ "//build/config/compiler:chromium_code" ]
-  configs += [ "//build/config/compiler:no_chromium_code" ]
-  configs += [
+  configs = [
     "../..:external_config",
     "../..:internal_config_base",
-    "../..:features",
-    "../..:toolchain",
   ]
 
   # TODO(machenbach): Translate from gyp.
   #['OS=="aix"', {
   #  'ldflags': [ '-Wl,-bbigtoc' ],
   #}],
 
   deps = [
     "../..:v8_libplatform",
     "//build/config/sanitizers:deps",
@@ skipping 15 matching lines @@
     # bytecode-utils.h.
     # C4309: 'static_cast': truncation of constant value
     cflags = [ "/wd4309" ]
 
     # Suppress warnings about importing locally defined symbols.
     if (is_component_build) {
       ldflags = [ "/ignore:4049", "/ignore:4217" ]
     }
   }
 }