Safe numeric library: base/numerics (copied from Chromium)

webrtc/base/numerics/safe_numerics.gyp

-# Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
+# Copyright (c) 2016 The WebRTC 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 in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 {
   'targets': [
     {
-      'target_name': 'isac_common',
+      # GN version: webrtc/base/numerics/BUILD.gn
+      'target_name': 'safe_numerics',
       'type': 'static_library',
       'sources': [
-        'audio_encoder_isac_t.h',
-        'audio_encoder_isac_t_impl.h',
-        'locked_bandwidth_info.cc',
-        'locked_bandwidth_info.h',
+        'safe_conversions.h',
+        'safe_conversions_impl.h',
+        'safe_math.h',
+        'safe_math_impl.h',
       ],
     },
   ],
 }