Fix line endings in content_scripts10/Default/Preferences.

This will allow the try servers to be used for changes that touch this
file.

TBR=phajdan.jr@chromium.org
NOTRY=true

BUG=NONE
TEST=NONE

Review URL: https://codereview.chromium.org/26484003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227568 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 227568