Roll chromium_revision aa04eb9..4d6ba6e (376768:376909)

build_overrides/build.gni

Index: build_overrides/build.gni
diff --git a/build_overrides/build.gni b/build_overrides/build.gni
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+# 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.
+
+# 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.
+mac_deployment_target_build_override = "10.7"