Better restriction to prevent Windows git install on XP or older.

Better restriction to prevent Windows git install on XP or older.

This is in preparation for once again making 1.8.5.2 the default Windows git.

Also remove the CHROME_HEADLESS condition, which confuses bot setup because the
same bot will sometimes run without that set (e.g. at slave startup) and with
it set (e.g. during a build), leading to the wrong, or even no, git installed.

R=maruel@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=250486

[M-A Ruel, 2014-02-11 20:11:12]

lgtm

https://codereview.chromium.org/160033002/diff/1/bootstrap/win/win_tools.bat
File bootstrap/win/win_tools.bat (right):

https://codereview.chromium.org/160033002/diff/1/bootstrap/win/win_tools.bat#...
bootstrap/win/win_tools.bat:40: for /f "tokens=2 delims=[]" %%i in ('ver') do
set VERSTR=%%i
Somewhat rubberstamp, it's been a long time since I had fun with batch file
syntax.

[Michael Moss, 2014-02-11 20:14:22]

https://codereview.chromium.org/160033002/diff/1/bootstrap/win/win_tools.bat
File bootstrap/win/win_tools.bat (right):

https://codereview.chromium.org/160033002/diff/1/bootstrap/win/win_tools.bat#...
bootstrap/win/win_tools.bat:40: for /f "tokens=2 delims=[]" %%i in ('ver') do
set VERSTR=%%i
On 2014/02/11 20:11:13, M-A Ruel wrote:
> Somewhat rubberstamp, it's been a long time since I had fun with batch file
> syntax.

Yeah, me too, and I have no idea if this is the best way to do it, but I tested
on both an XP and Win7 bot, and it appears to do the right thing.

[Michael Moss, 2014-02-11 20:19:07]

Committed patchset #1 manually as r250486.