Allow WebRTC to require Mac 10.7 deployments in GN builds.

build_overrides/webrtc.gni

 # Copyright 2015 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.
 
+# TODO(https://bugs.chromium.org/p/webrtc/issues/detail?id=5453):

[brettw, 2016/02/19 22:04:40]

Per in-person discussion we were going to rename this file to something more
generic than "webrtc"

+# switch callers to use rtc_build_with_chromium instead.
 build_with_chromium = true
+rtc_build_with_chromium = true
+
+# See https://bugs.chromium.org/p/webrtc/issues/detail?id=5453.
+# Some WebRTC targets require the 10.7 deployment version of the Mac SDK,
+# but those targets are only used in non-Chromium builds. We can remove
+# this when Chromium drops 10.6 support and also requires 10.7.
+rtc_require_mac_10_7_deployment = false
 
 # Exclude pulse audio on Chromium since its prerequisites don't require
 # pulse audio.
 rtc_include_pulse_audio = false
 
 # Exclude internal ADM since Chromium uses its own IO handling.
 rtc_include_internal_audio_device = false
 
 declare_args() {
   # TODO(dpranke): This is a hack needed to get iOS to build w/ a
   # patched version of WebRTC so that we can access the xmllite
   # library. Remove this once we've figured out how to get WebRTC building
   # properly.
   ios_use_webrtc = false
 }