Make new Windows git the default.

This can be overridden, and the old git installed, with:

set DEPOT_TOOLS_GIT_1852=0
rd /s /q git-1.8.5.2.chromium.1_bin git-1.8.0_bin
gclient

R=maruel@chromium.org

Review URL: https://codereview.chromium.org/136693024

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@250132 0039d316-1c4b-4281-b951-d872f2087c98

bootstrap/win/win_tools.bat

@@ -26,8 +26,8 @@ if "%1" == "force" (
 
 
 :GIT_CHECK
-if "%DEPOT_TOOLS_GIT_1852%" == "1" goto :GIT_1852_CHECK
-goto :GIT_180_CHECK
+if "%DEPOT_TOOLS_GIT_1852%" == "0" goto :GIT_180_CHECK
+goto :GIT_1852_CHECK
 
 
 :GIT_1852_CHECK