In Windows (already worked correctly in posix): gclient wouldn't correctly update depot_tools when called.

Refactored away the bootstrap depot_tools update flow which only still existed in Windows.

Patch contributed by gab@chromium.org

R=maruel@chromium.org
BUG=
TEST=Running `gclient sync` from src/ and see depot_tools being correctly updated under a git depot_tools checkout.

Review URL: https://chromiumcodereview.appspot.com/9751009

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@132191 0039d316-1c4b-4281-b951-d872f2087c98

Set svn:eol-style=CRLF for all .bat files and everything in bootstrap/win/
Set svn:eol-style=LF for everything else.

Also delete depot_tools/git_cl/ since it's not used anymore.
Review URL: http://codereview.chromium.org/8055016

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@103051 0039d316-1c4b-4281-b951-d872f2087c98

Create an update_depot_tools.bat file to use for updated when on cygwin, and
properly call it from the update_depot_tools shell script and gclient batch
files.

BUG=none
TEST=gclient sync and git cl work again on cygwin.  Can also turn echo on in update_depot_tools.bat to verify updating working correctly.

Review URL: http://codereview.chromium.org/3856006

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@63234 0039d316-1c4b-4281-b951-d872f2087c98

TBR=nsylvain
Review URL: http://codereview.chromium.org/93106

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@14400 0039d316-1c4b-4281-b951-d872f2087c98

Review URL: http://codereview.chromium.org/92087

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@14349 0039d316-1c4b-4281-b951-d872f2087c98