root_build_dir will always be the root build output directory.
root_out_dir is the directory "for the current toolchain".
WebRTC.framework is always in the root output directory.
Bug: webrtc:7507
Change-Id: I30b8eccaac3ed07e40c86acf361ee24a1c20b074
Reviewed-on: https://webrtc-review.googlesource.com/7640
Commit-Queue: Kári Helgason <kthelgason@webrtc.org>
Reviewed-by: Kári Helgason <kthelgason@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#20237}