Roll windows git binary package up to v6 everywhere.

Thus solving the sh.exe problem once and for all...

R=hinoka@google.com, hinoka@chromium.org
BUG=383455, 241556, 389361, 380958

Review URL: https://codereview.chromium.org/372413002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@281844 0039d316-1c4b-4281-b951-d872f2087c98

bootstrap/win/win_tools.bat

@@ -64,8 +64,8 @@ goto :GIT_190_CHECK
 
 
 :GIT_190_CHECK
-set GIT_ERASE_TOP=4
-set GIT_VERSION=1.9.0.chromium.5
+set GIT_ERASE_TOP=5
+set GIT_VERSION=1.9.0.chromium.6
 
 if not "%DEPOT_TOOLS_GIT_BLEEDING%" == "1" goto :GIT_190_CHECK_REST
 set GIT_ERASE_TOP=5