Fix dependencies on mac in tools/BUILD.gn.

Fix dependencies on mac in tools/BUILD.gn.
This can probly be done in a neater way but right now this is blocking the roll.

TBR=kjellander@webrtc.org

Committed: https://chromium.googlesource.com/external/webrtc/+/1d2dbdb0c07ea750a9efa11fbc88185b52cba9e9

[commit-bot: I haz the power, 2016-04-24 16:24:36]

Description was changed from

==========
Fix dependencies on mac in tools/BUILD.gn.
This can probly be done in a neater way but right now this is blocking the roll.

TBR=kjellander@webrtc.org
==========

to

==========
Fix dependencies on mac in tools/BUILD.gn.
This can probly be done in a neater way but right now this is blocking the roll.

TBR=kjellander@webrtc.org

Committed: https://crrev.com/1d2dbdb0c07ea750a9efa11fbc88185b52cba9e9
Cr-Commit-Position: refs/heads/master@{#12480}
==========

[commit-bot: I haz the power, 2016-04-24 16:24:37]

Patchset 1 (id:??) landed as
https://crrev.com/1d2dbdb0c07ea750a9efa11fbc88185b52cba9e9
Cr-Commit-Position: refs/heads/master@{#12480}

[tommi, 2016-04-24 16:24:38]

Description was changed from

==========
Fix dependencies on mac in tools/BUILD.gn.
This can probly be done in a neater way but right now this is blocking the roll.

TBR=kjellander@webrtc.org

Committed: https://crrev.com/1d2dbdb0c07ea750a9efa11fbc88185b52cba9e9
Cr-Commit-Position: refs/heads/master@{#12480}
==========

to

==========
Fix dependencies on mac in tools/BUILD.gn.
This can probly be done in a neater way but right now this is blocking the roll.

TBR=kjellander@webrtc.org

Committed:
https://chromium.googlesource.com/external/webrtc/+/1d2dbdb0c07ea750a9efa11fb...
==========

[tommi, 2016-04-24 16:24:40]

Committed patchset #1 (id:1) manually as
1d2dbdb0c07ea750a9efa11fbc88185b52cba9e9 (presubmit successful).

[kjellander_webrtc, 2016-04-25 05:42:50]

lgtm for now. I'm fixing this properly in
https://codereview.webrtc.org/1921513002/