Bump git bleeding edge up to 6.

This includes the new (fast) custom sh.exe/bash.exe/msys-1.0.dll.

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

Review URL: https://codereview.chromium.org/364133003

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@281645 0039d316-1c4b-4281-b951-d872f2087c98

bootstrap/win/win_tools.bat

@@ -68,8 +68,8 @@ set GIT_ERASE_TOP=4
 set GIT_VERSION=1.9.0.chromium.5
 
 if not "%DEPOT_TOOLS_GIT_BLEEDING%" == "1" goto :GIT_190_CHECK_REST
-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
 
 :GIT_190_CHECK_REST
 if "%DEPOT_TOOLS_GIT_190%" == "0" goto :GIT_1852_CHECK