Windows users wouldn't get the same behavior on git cl vs gcl.
Improve automatic CRLF<->LF conversion, some gcl users would be \n repeated in
their description depending on the editor used.

R=dpranke@chromium.org
BUG=
TEST=


Review URL: http://codereview.chromium.org/8360007

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@107106 0039d316-1c4b-4281-b951-d872f2087c98