Reapply/merge derived_sources.gyp useless use of cat (demoggification)

Reapply/merge derived_sources.gyp useless use of cat (demoggification)

This replaces 2 instances in GYP of
<!(cat <(foo_files_list))
with:
<@(files_list)
...avoiding indirection and a shell out to cat.

Nico's 1-line CL:
Make code slightly less complicated
https://codereview.chromium.org/26980003/
...was clobbered by Kihong's large, long-running CL:
Support partial interface for test support idls
https://codereview.chromium.org/24053003/

Nico noted this in comment:
https://codereview.chromium.org/24053003/#msg50

This CL cleans up and merges Nico's prior demoggification.
http://en.wikipedia.org/wiki/Useless_use_of_cat

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=159971

[Nils Barth (inactive), 2013-10-18 00:56:48]

Hi Nico, fixed per comment.
(haraken: simple GYP cleanup that got clobbered by a separate CL)

[haraken, 2013-10-18 01:00:32]

LGTM

[commit-bot: I haz the power, 2013-10-18 01:02:53]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/nbarth@chromium.org/27873002/1

[Nico, 2013-10-18 01:10:58]

Hi,

I'm not sure if my comment is correct since rietveld doesn't show the
side-by-side diff and I find the "Raw" diff I'm looking at a bit hard to read,
but:

+ '<@(main_idl_files_list)',

I think this should be

+ '<@(main_idl_files)',

maybe?

[Nico, 2013-10-18 01:11:07]

(thanks for taking this on btw!)

[Nils Barth (inactive), 2013-10-18 01:18:06]

On 2013/10/18 01:10:58, Nico wrote:
> Hi,
> 
> I'm not sure if my comment is correct since rietveld doesn't show the
> side-by-side diff and I find the "Raw" diff I'm looking at a bit hard to read,
> but:
> 
> + '<@(main_idl_files_list)',
> 
> I think this should be
> 
> + '<@(main_idl_files)',
> 
> maybe?

Oops, my bad.
Fixed, reuploading.

[Nico, 2013-10-18 01:22:03]

lgtm

Thank you!

[Nils Barth (inactive), 2013-10-18 01:22:31]

On 2013/10/18 01:22:03, Nico wrote:
> lgtm
> 
> Thank you!

n/p! (Just gotta wait for tree to reopen...)

[commit-bot: I haz the power, 2013-10-18 02:41:46]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/nbarth@chromium.org/27873002/145001

[commit-bot: I haz the power, 2013-10-18 23:20:30]

Change committed as 159971