Captive Portal Interstitial: Use SSID even if connection type isn't Wi-Fi.

Captive Portal Interstitial: Use SSID even if connection type isn't Wi-Fi.

|IsWiFiConnection| isn't accurate on some platforms. Whenever SSID is available,
use it and ignore |IsWiFiConnection|. This CL also adds a delegate to
|CaptivePortalBlockingPage| for better testing.

BUG=451272
Committed: https://crrev.com/67f91dc7b23fca0bd5c78f179c76302d411e6f06
Cr-Commit-Position: refs/heads/master@{#314391}

[meacer, 2015-02-03 01:05:04]

meacer@chromium.org changed reviewers:
+ felt@chromium.org

[meacer, 2015-02-03 01:05:04]

felt: Can you PTAL? Thanks.

[felt, 2015-02-03 08:01:49]

Nice catch, and I like the use of the delegate. lgtm

[meacer, 2015-02-03 19:07:06]

Thanks. I was going to land this after
https://codereview.chromium.org/899573002/, but it actually works without the
Linux check, so I removed Linux SSID call from this CL. I'll add it back once
https://codereview.chromium.org/899573002/ lands.

[meacer, 2015-02-03 19:10:36]

The CQ bit was checked by meacer@chromium.org

[commit-bot: I haz the power, 2015-02-03 19:11:56]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/894153003/20001

[commit-bot: I haz the power, 2015-02-03 19:59:55]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-02-03 20:00:59]

Patchset 2 (id:??) landed as
https://crrev.com/67f91dc7b23fca0bd5c78f179c76302d411e6f06
Cr-Commit-Position: refs/heads/master@{#314391}