Revert of clang/win: Stop passing -Qunused-arguments.

Revert of clang/win: Stop passing -Qunused-arguments. (patchset #6 id:100001 of https://codereview.chromium.org/1828543003/ )

Reason for revert:
Speculative; official builds mysteriously exploded (crbug.com/599186) and this is on the blame list...

Original issue's description:
> clang/win: Stop passing -Qunused-arguments.
>
> All flags except /GS and /GL are accepted by clang-cl by now. To be able
> to turn on -Qunused-arguments, don't pass /GS and /GL in clang builds
> for now.
>
> BUG=504658, 598772, 598767
> NOTRY=true
>
> Committed: https://crrev.com/de51a84b69b5b1dd458c65f6aaf2335f81b57785
> Cr-Commit-Position: refs/heads/master@{#383954}
>
> R=hans@chromium.org
>
> Committed: https://crrev.com/cb19a4e78e9c472914680235c75f2b9afe554b20
> Cr-Commit-Position: refs/heads/master@{#384004}

TBR=hans@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=504658, 598772, 598767
Committed: https://crrev.com/12edf36d8d15b8f517b750b6dc1eb12e4d21f681
Cr-Commit-Position: refs/heads/master@{#384033}

[Nico, 2016-03-30 18:37:20]

Created Revert of clang/win: Stop passing -Qunused-arguments.

[commit-bot: I haz the power, 2016-03-30 18:38:00]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1846633004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1846633004/1

[commit-bot: I haz the power, 2016-03-30 18:38:39]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-03-30 18:41:55]

Description was changed from

==========
Revert of clang/win: Stop passing -Qunused-arguments. (patchset #6 id:100001 of
https://codereview.chromium.org/1828543003/ )

Reason for revert:
Speculative; official builds mysteriously exploded (crbug.com/599186) and this
is on the blame list...

Original issue's description:
> clang/win: Stop passing -Qunused-arguments.
> 
> All flags except /GS and /GL are accepted by clang-cl by now. To be able
> to turn on -Qunused-arguments, don't pass /GS and /GL in clang builds
> for now.
> 
> BUG=504658,598772,598767
> NOTRY=true
> 
> Committed: https://crrev.com/de51a84b69b5b1dd458c65f6aaf2335f81b57785
> Cr-Commit-Position: refs/heads/master@{#383954}
> 
> R=hans@chromium.org
> 
> Committed: https://crrev.com/cb19a4e78e9c472914680235c75f2b9afe554b20
> Cr-Commit-Position: refs/heads/master@{#384004}

TBR=hans@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=504658,598772,598767
==========

to

==========
Revert of clang/win: Stop passing -Qunused-arguments. (patchset #6 id:100001 of
https://codereview.chromium.org/1828543003/ )

Reason for revert:
Speculative; official builds mysteriously exploded (crbug.com/599186) and this
is on the blame list...

Original issue's description:
> clang/win: Stop passing -Qunused-arguments.
>
> All flags except /GS and /GL are accepted by clang-cl by now. To be able
> to turn on -Qunused-arguments, don't pass /GS and /GL in clang builds
> for now.
>
> BUG=504658,598772,598767
> NOTRY=true
>
> Committed: https://crrev.com/de51a84b69b5b1dd458c65f6aaf2335f81b57785
> Cr-Commit-Position: refs/heads/master@{#383954}
>
> R=hans@chromium.org
>
> Committed: https://crrev.com/cb19a4e78e9c472914680235c75f2b9afe554b20
> Cr-Commit-Position: refs/heads/master@{#384004}

TBR=hans@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=504658,598772,598767

Committed: https://crrev.com/12edf36d8d15b8f517b750b6dc1eb12e4d21f681
Cr-Commit-Position: refs/heads/master@{#384033}
==========

[commit-bot: I haz the power, 2016-03-30 18:41:56]

Patchset 1 (id:??) landed as
https://crrev.com/12edf36d8d15b8f517b750b6dc1eb12e4d21f681
Cr-Commit-Position: refs/heads/master@{#384033}

[Nico, 2016-03-30 19:42:39]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1844793003/ by thakis@chromium.org.

The reason for reverting is: Wasn't the culprit for that problem..