libaddressinput: update scoped_ptr.h

BUG=none
TEST=unit tests

Review URL: https://codereview.chromium.org/114863003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@241217 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 241217