Roll buildtools from 93b32d0 -> d4dd4f79 to get a new GN build.

Roll buildtools from 93b32d0 -> d4dd4f79 to get a new GN build.

This picks up:

    Roll the GN binaries to #318791.

    Roll the GN binaries from 317120:318791 (from git 74add9fc39
    to 3d7a60db).

    This fixes 'gn clean' and picks up some new features for
    introspections (see #317159).

TBR=brettw@chromium.org
BUG=430215
Committed: https://crrev.com/162dd1a3d5b634a988884a290eaaa5d8a31c6a71
Cr-Commit-Position: refs/heads/master@{#318952}

[Dirk Pranke, 2015-03-03 20:59:35]

The CQ bit was checked by dpranke@chromium.org

[commit-bot: I haz the power, 2015-03-03 21:00:33]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/965963002/60001

[commit-bot: I haz the power, 2015-03-03 21:05:25]

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

[commit-bot: I haz the power, 2015-03-03 21:05:26]

Try jobs failed on following builders:
  android_aosp on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/android_aosp/bu...)
  android_chromium_gn_compile_dbg on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/android_chromiu...)
  chromium_presubmit on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/chromium_presub...)
  linux_chromium_compile_dbg_32_ng on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)
  linux_chromium_gn_dbg on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[Dirk Pranke, 2015-03-03 21:14:28]

The CQ bit was checked by dpranke@chromium.org

[commit-bot: I haz the power, 2015-03-03 21:16:24]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/965963002/80001

[brettw, 2015-03-03 22:58:10]

lgtm

[commit-bot: I haz the power, 2015-03-03 23:05:46]

Committed patchset #5 (id:80001)

[commit-bot: I haz the power, 2015-03-03 23:06:21]

Patchset 5 (id:??) landed as
https://crrev.com/162dd1a3d5b634a988884a290eaaa5d8a31c6a71
Cr-Commit-Position: refs/heads/master@{#318952}