[rac] Use Chrome's scoped pointers in libaddressinput.

BUG=327046

Review URL: https://codereview.chromium.org/109483014

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@241700 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 241700