Roll libphonenumber to r621.

BUG=94925
NOTRY=true
R=thakis@chromium.org

Review URL: https://codereview.chromium.org/28923006

Patch from Philippe Liard <pliard@chromium.org>.

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@229898 0039d316-1c4b-4281-b951-d872f2087c98
Update .DEPS.git

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@229899 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 229898
SVN changes up to revision 229899