Rollfowrad of crrev.com/2720863003/: Make --headless flag work on Mac
Fix added child dependency in headless_lib
This is pending on splitting headless library so it can be property build in windows.
BUG=687407

Review-Url: https://codereview.chromium.org/2723933003
Cr-Commit-Position: refs/heads/master@{#454074}
4 files changed