Revert of Remove depenedency on GYP_DEFINES in clang gclient hook

Revert of Remove depenedency on GYP_DEFINES in clang gclient hook (patchset #2 id:20001 of https://codereview.chromium.org/2733043002/ )

Reason for revert:
update.py is used by non-chromium devs. See:
https://codereview.chromium.org/2749003002/

Original issue's description:
> Remove dependency on GYP_DEFINES in clang gclient hook
> 
> The gold plugin is needed only for linux official builds. However, since
> it's only 17MB, it's better to always download it rather than having it
> depend on GYP_DEFINES.
> 
> BUG=570091, 699210
> 
> Review-Url: https://codereview.chromium.org/2733043002
> Cr-Commit-Position: refs/heads/master@{#455991}
> Committed: https://chromium.googlesource.com/chromium/src/+/57310cedbe5d558ba806b3f60f752b84e20a65eb

TBR=thakis@chromium.org,krasin@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=570091, 699210
Review-Url: https://codereview.chromium.org/2748973003
Cr-Commit-Position: refs/heads/master@{#456729}
Committed: https://chromium.googlesource.com/chromium/src/+/081e3434463b81db9b72d96e4a4c5e8016f02b60

[agrieve, 2017-03-14 15:45:57]

The CQ bit was checked by agrieve@chromium.org

[agrieve, 2017-03-14 15:45:57]

Created Revert of Remove depenedency on GYP_DEFINES in clang gclient hook

[commit-bot: I haz the power, 2017-03-14 15:46:46]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[krasin1, 2017-03-14 16:25:07]

lgtm

[commit-bot: I haz the power, 2017-03-14 16:41:34]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1489506357211250, "parent_rev":
"4b6a5c7bc31e6a331fc8f2d1e6cefaaeed69c597", "commit_rev":
"081e3434463b81db9b72d96e4a4c5e8016f02b60"}

[commit-bot: I haz the power, 2017-03-14 16:42:12]

Description was changed from

==========
Revert of Remove depenedency on GYP_DEFINES in clang gclient hook (patchset #2
id:20001 of https://codereview.chromium.org/2733043002/ )

Reason for revert:
update.py is used by non-chromium devs. See:
https://codereview.chromium.org/2749003002/

Original issue's description:
> Remove dependency on GYP_DEFINES in clang gclient hook
> 
> The gold plugin is needed only for linux official builds. However, since
> it's only 17MB, it's better to always download it rather than having it
> depend on GYP_DEFINES.
> 
> BUG=570091, 699210
> 
> Review-Url: https://codereview.chromium.org/2733043002
> Cr-Commit-Position: refs/heads/master@{#455991}
> Committed:
https://chromium.googlesource.com/chromium/src/+/57310cedbe5d558ba806b3f60f75...

TBR=thakis@chromium.org,krasin@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=570091, 699210
==========

to

==========
Revert of Remove depenedency on GYP_DEFINES in clang gclient hook (patchset #2
id:20001 of https://codereview.chromium.org/2733043002/ )

Reason for revert:
update.py is used by non-chromium devs. See:
https://codereview.chromium.org/2749003002/

Original issue's description:
> Remove dependency on GYP_DEFINES in clang gclient hook
> 
> The gold plugin is needed only for linux official builds. However, since
> it's only 17MB, it's better to always download it rather than having it
> depend on GYP_DEFINES.
> 
> BUG=570091, 699210
> 
> Review-Url: https://codereview.chromium.org/2733043002
> Cr-Commit-Position: refs/heads/master@{#455991}
> Committed:
https://chromium.googlesource.com/chromium/src/+/57310cedbe5d558ba806b3f60f75...

TBR=thakis@chromium.org,krasin@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=570091, 699210

Review-Url: https://codereview.chromium.org/2748973003
Cr-Commit-Position: refs/heads/master@{#456729}
Committed:
https://chromium.googlesource.com/chromium/src/+/081e3434463b81db9b72d96e4a4c...
==========

[commit-bot: I haz the power, 2017-03-14 16:42:13]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/081e3434463b81db9b72d96e4a4c...