GN: Fix references to $root_build_dir/natives_blob.bin -> $root_out_dir

GN: Fix references to $root_build_dir/natives_blob.bin -> $root_out_dir

root_build_dir == root_out_dir in all of these contexts anyways, but
this is more correct.

BUG=

Committed: https://crrev.com/b37b712135a1fadf419b6f6145301c545812437a
Cr-Commit-Position: refs/heads/master@{#355725}

[agrieve, 2015-10-23 02:24:44]

agrieve@chromium.org changed reviewers:
+ brettw@chromium.org

[agrieve, 2015-10-23 02:25:04]

Description was changed from

==========
GN: Fix references to $root_build_dir/natives_blob.bin -> $root_out_dir

root_build_dir == root_out_dir in all of these contexts anyways, but
this is more correct.

BUG=
==========

to

==========
GN: Fix references to $root_build_dir/natives_blob.bin -> $root_out_dir

root_build_dir == root_out_dir in all of these contexts anyways, but
this is more correct.

BUG=
==========

[agrieve, 2015-10-23 02:25:04]

agrieve@chromium.org changed reviewers:
+ pkotwicz@chromium.org

[brettw, 2015-10-23 02:31:00]

lgtm

[agrieve, 2015-10-23 03:26:21]

The CQ bit was checked by agrieve@chromium.org

[commit-bot: I haz the power, 2015-10-23 03:26:40]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1410643013/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1410643013/1

[commit-bot: I haz the power, 2015-10-23 03:53:52]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-10-23 03:54:32]

Patchset 1 (id:??) landed as
https://crrev.com/b37b712135a1fadf419b6f6145301c545812437a
Cr-Commit-Position: refs/heads/master@{#355725}