Roll buildtools ef7f1f539c..acafdaa4e8

Roll buildtools ef7f1f539c..acafdaa4e8

  In order to roll GN adf2cc6066..e35662dd4e (r354085:r356963) and pick up
  the following changes:

  784ffb6 Fix GN unittests on windows broken by abs-path change
  987f4a5 [GN] Allow spaces in output names and other substitutions.
  5b6813c Make sure abs-path gn labels have separate target_gen_dirs
  1c010e5 Make GN --as=output relative to the root build directory.
  a2d721a Handle Mozilla license blocks in the GN header checker.

TBR=brettw@chromium.org
CQ_EXTRA_TRYBOTS=tryserver.chromium.mac:mac_chromium_gn_dbg;tryserver.chromium.win:win8_chromium_gn_dbg,win_chromium_gn_x64_rel

Committed: https://crrev.com/0d34fd4ba8f68151f4cc38b61c2a1dd63c3e281f
Cr-Commit-Position: refs/heads/master@{#357022}

[Dirk Pranke, 2015-10-29 22:49:31]

The CQ bit was checked by dpranke@chromium.org

[commit-bot: I haz the power, 2015-10-29 22:50:35]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1406983009/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1406983009/1

[commit-bot: I haz the power, 2015-10-30 00:54:49]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-10-30 00:54:49]

Try jobs failed on following builders:
  win_chromium_gn_x64_rel on tryserver.chromium.win (JOB_TIMED_OUT, no build
URL)

[Dirk Pranke, 2015-10-30 01:29:21]

The CQ bit was checked by dpranke@chromium.org

[commit-bot: I haz the power, 2015-10-30 01:29:49]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1406983009/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1406983009/1

[commit-bot: I haz the power, 2015-10-30 02:15:11]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-10-30 02:16:05]

Patchset 1 (id:??) landed as
https://crrev.com/0d34fd4ba8f68151f4cc38b61c2a1dd63c3e281f
Cr-Commit-Position: refs/heads/master@{#357022}