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PreloadAddressValidator implements the same interface as Chromium's
current AddressValidator but calls libaddressinput AddressValidator to
perform the actual work, to simplify switching Chromium Autofill over to
using libaddressinput. All existing test cases are ported.

The suggestions functionality is currently stubbed out.

R=rouslan@chromium.org
BUG=

Review URL: https://codereview.chromium.org/292313008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@274507 0039d316-1c4b-4281-b951-d872f2087c98