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

Revert of clang/win: Stop passing -Qunused-arguments in pdfium too. (patchset #1 id:1 of https://codereview.chromium.org/1887643002/ )

Reason for revert:
pdfium still passes /GS

Original issue's description:
> clang/win: Stop passing -Qunused-arguments in pdfium too.
> 
> We stopped passing this in Chromium a while ago.
> 
> BUG=504658
> 
> Committed: https://pdfium.googlesource.com/pdfium/+/112be9813ed7bf4e082048eda5f4a7d3837d116c

TBR=thestig@chromium.org,dsinclair@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=504658
Committed: https://pdfium.googlesource.com/pdfium/+/a364fad07e5baf4a72ea734e64fb55664cab075e

[Nico, 2016-04-13 13:19:31]

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

[commit-bot: I haz the power, 2016-04-13 13:19:39]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1883823002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1883823002/1

[commit-bot: I haz the power, 2016-04-13 13:19:48]

Description was changed from

==========
Revert of clang/win: Stop passing -Qunused-arguments in pdfium too. (patchset #1
id:1 of https://codereview.chromium.org/1887643002/ )

Reason for revert:
pdfium still passes /GS

Original issue's description:
> clang/win: Stop passing -Qunused-arguments in pdfium too.
> 
> We stopped passing this in Chromium a while ago.
> 
> BUG=504658
> 
> Committed:
https://pdfium.googlesource.com/pdfium/+/112be9813ed7bf4e082048eda5f4a7d3837d...

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

to

==========
Revert of clang/win: Stop passing -Qunused-arguments in pdfium too. (patchset #1
id:1 of https://codereview.chromium.org/1887643002/ )

Reason for revert:
pdfium still passes /GS

Original issue's description:
> clang/win: Stop passing -Qunused-arguments in pdfium too.
> 
> We stopped passing this in Chromium a while ago.
> 
> BUG=504658
> 
> Committed:
https://pdfium.googlesource.com/pdfium/+/112be9813ed7bf4e082048eda5f4a7d3837d...

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

Committed:
https://pdfium.googlesource.com/pdfium/+/a364fad07e5baf4a72ea734e64fb55664cab...
==========

[commit-bot: I haz the power, 2016-04-13 13:19:49]

Committed patchset #1 (id:1) as
https://pdfium.googlesource.com/pdfium/+/a364fad07e5baf4a72ea734e64fb55664cab...