Don't suggest autofill profiles that are subsets of other profiles.

Don't suggest autofill profiles that are subsets of other profiles.

Before this patch, we had code to avoid showing duplicates, but it would not prevent showing subsets. For example, if you had profiles:

- Daisy Green, 123 Main, Littleton, CO
- Daisy Green, 123 Main, Littleton, CO, 80161

It would suggest both.

BUG=463305
Committed: https://crrev.com/5617cd9cfaab4b623cb2ffbc5e0cb2d8e70a148a
Cr-Commit-Position: refs/heads/master@{#319539}

[Evan Stade, 2015-03-04 00:06:13]

estade@chromium.org changed reviewers:
+ brettw@chromium.org

[Evan Stade, 2015-03-05 18:37:38]

ping

[brettw, 2015-03-06 17:26:45]

Sorry, this is the third time I've looked at this review without sending email
:(   LGTM

[Evan Stade, 2015-03-06 20:21:24]

The CQ bit was checked by estade@chromium.org

[commit-bot: I haz the power, 2015-03-06 20:32:32]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/970403002/1

[commit-bot: I haz the power, 2015-03-07 00:31:02]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-07 00:31:59]

Patchset 1 (id:??) landed as
https://crrev.com/5617cd9cfaab4b623cb2ffbc5e0cb2d8e70a148a
Cr-Commit-Position: refs/heads/master@{#319539}