Update bleeding edge version of git on windows to 2.8.3.
Update bleeding edge version of git on windows to 2.8.3.

TBR=nodir@chromium.org
BUG=600028

Review URL: https://codereview.chromium.org/2010573004 .

git-svn-id: fd409f4bdeea2bb50a5d34bb4d4bfc2046a5a3dd@300664 0039d316-1c4b-4281-b951-d872f2087c98

primiano/depot_tools,CoherentLabs/depot_tools,CoherentLabs/depot_tools,primiano/depot_tools,primiano/depot_tools