Rework/update toolchain script for vs2015

Rework/update toolchain script for vs2015

This is the other side of https://codereview.chromium.org/1163723003/

The changes here are to remove the use of 'vs2013_files' and 'win8sdk'
(as those will be different numbers soon enough) but still maintain
behaviour for the old "style" while in transition.

Secondarily, to remove the dependence of these two scripts on
'toolchain2013.py' as most of the script is now unused.

R=dpranke@chromium.org
BUG=440500, 492774
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=295485

[Dirk Pranke, 2015-06-01 22:33:48]

should you be deleting toolchain2013.py in this?

[scottmg, 2015-06-01 22:38:33]

On 2015/06/01 22:33:48, Dirk Pranke wrote:
> should you be deleting toolchain2013.py in this?

Mostly. (I can also delete the 7z folder at that point too.)

I would like not to do it all at once because I have to investigate separately
how other teams have poked into these details (webrtc, nacl, etc. have forked
the contents of src/build/).

[Dirk Pranke, 2015-06-01 22:44:08]

On 2015/06/01 22:38:33, scottmg wrote:
> On 2015/06/01 22:33:48, Dirk Pranke wrote:
> > should you be deleting toolchain2013.py in this?
> 
> Mostly. (I can also delete the 7z folder at that point too.)
> 
> I would like not to do it all at once because I have to investigate separately
> how other teams have poked into these details (webrtc, nacl, etc. have forked
> the contents of src/build/).

ok. lgtm.

[scottmg, 2015-06-01 22:49:53]

The CQ bit was checked by scottmg@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-06-01 22:50:40]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1165563003/120001

[commit-bot: I haz the power, 2015-06-01 22:53:24]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-06-01 22:53:24]

Dry run: This issue passed the CQ dry run.

[scottmg, 2015-06-01 23:39:36]

(I fiddled a little more with the file list, was missing some files for 2015)

[scottmg, 2015-06-02 02:51:44]

The CQ bit was checked by scottmg@chromium.org

[scottmg, 2015-06-02 02:51:45]

The patchset sent to the CQ was uploaded after l-g-t-m from dpranke@chromium.org
Link to the patchset: https://codereview.chromium.org/1165563003/#ps140001
(title: "add missing ucrt files")

[commit-bot: I haz the power, 2015-06-02 02:51:51]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1165563003/140001

[commit-bot: I haz the power, 2015-06-02 02:54:54]

Committed patchset #8 (id:140001) as
http://src.chromium.org/viewvc/chrome?view=rev&revision=295485