GitLab

This doesn't use the dynamic library loader if the SDK has libxpc.dylib, and
instead just relies on libSystem to load it.

BUG=395364
R=mark@chromium.org

Review URL: https://codereview.chromium.org/403193002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@284427 0039d316-1c4b-4281-b951-d872f2087c98