Use |IsOriginSecure| for mark-HTTP-nonsecure field trial

Use |IsOriginSecure| for mark-HTTP-nonsecure field trial

When the flag or field trial is set such that non-secure origins will be
marked as dubious/non-secure, use |IsOriginSecure| to determine whether
an origin is non-secure, instead of simply treating http:// and ftp://
as non-secure. This means that http://nytimes.com will be marked as
dubious/non-secure, but not http://localhost (for example).

BUG=487499
TEST=Enable the "Mark non-secure as non-secure" flag in
chrome://flags. Visit http://nytimes.com and observe that the lock icon
is red and crossed out. Visit an http:// URL on localhost and observe
that the lock icon is neutral.

Committed: https://crrev.com/5f99677ac4f9b8180ee7fd2f0d5c85e91828a951
Cr-Commit-Position: refs/heads/master@{#329774}

[estark, 2015-05-13 23:19:16]

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

[estark, 2015-05-13 23:19:16]

meacer: PTAL?

palmer: FYI, as we discussed IRL earlier this week.

[meacer, 2015-05-14 00:14:49]

LGTM

[estark, 2015-05-14 00:16:44]

The CQ bit was checked by estark@chromium.org

[commit-bot: I haz the power, 2015-05-14 00:19:02]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1143503003/1

[commit-bot: I haz the power, 2015-05-14 01:36:59]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-14 01:38:41]

Patchset 1 (id:??) landed as
https://crrev.com/5f99677ac4f9b8180ee7fd2f0d5c85e91828a951
Cr-Commit-Position: refs/heads/master@{#329774}

[sergeyv, 2015-05-14 10:52:16]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1130843005/ by sergeyv@chromium.org.

The reason for reverting is: Android Tests dbg bot is failing:
http://build.chromium.org/p/chromium.linux/builders/Android%20Tests%20(dbg)

The reason of this failure is following patch:
https://codereview.chromium.org/1123943002/

I had to revert this patch because it is a follow up..