Get rid of vista_winnt

[RLZ] Get rid of vista_winnt.h

This file was needed for compiling on pre-Vista SDKs. Since now Chromium requires at least Windows 7 SDK, it should not be needed anymore.

BUG=172607
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=180289

[mnaganov (inactive), 2013-01-30 21:34:29]

Roger, Nico, please take a look.

Some of trybots are red, but this is due to test failures (flakes?). I guess,
deleting an .h file should only break compilation. Also, linux and mac has
failed tests, which can't be affected in any way by deleting a Windows-only
source.

[Nico, 2013-01-30 21:36:48]

I'll defer to Roger. This predates my involvement in rlz, and I only worked on
the mac bits of it.

[mnaganov (inactive), 2013-02-01 09:13:59]

Is Rodger actually in town?

[Roger Tawa OOO till Jul 10th, 2013-02-01 15:15:29]

lgtm

Sorry for delay, I thought I had lgtm'ed yesterday.

[commit-bot: I haz the power, 2013-02-01 15:17:00]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/mnaganov@chromium.org/12092068/1

[commit-bot: I haz the power, 2013-02-01 21:44:47]

Retried try job too often on win_rel for step(s) browser_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=win_rel&nu...

[commit-bot: I haz the power, 2013-02-02 22:39:12]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/mnaganov@chromium.org/12092068/1

[commit-bot: I haz the power, 2013-02-03 01:55:14]

Retried try job too often on win_rel for step(s) browser_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=win_rel&nu...

[commit-bot: I haz the power, 2013-02-03 03:56:56]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/mnaganov@chromium.org/12092068/1

[commit-bot: I haz the power, 2013-02-03 05:12:14]

Change committed as 180289