Remove unused securityState code in WebInspector.SecurityModel.

Remove unused securityState code in WebInspector.SecurityModel.

The Chrome-side security handler now sends a SecurityStyleChanged event upon being enabled, so it is not necessary for SecurityModel to do anything to keep track of security state anymore.

BUG=

Committed: https://crrev.com/c9ebdc59e3e757dead4dad86efb729bf2ccd6d69
git-svn-id: svn://svn.chromium.org/blink/trunk@202016 bbb929c8-8fbe-4397-9dbb-9b2b20218538

[lgarron, 2015-09-04 23:19:38]

lgarron@chromium.org changed reviewers:
+ pfeldman@chromium.org

[lgarron, 2015-09-04 23:19:39]

pfeldman@: Could you review?

[lgarron, 2015-09-04 23:34:01]

The CQ bit was checked by lgarron@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-09-04 23:34:15]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1309953003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1309953003/1

[commit-bot: I haz the power, 2015-09-05 00:50:02]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-09-05 00:50:02]

Dry run: This issue passed the CQ dry run.

[lgarron, 2015-09-09 22:25:52]

ping :-)

[pfeldman, 2015-09-09 23:54:36]

lgtm

[lgarron, 2015-09-09 23:55:03]

The CQ bit was checked by lgarron@chromium.org

[commit-bot: I haz the power, 2015-09-09 23:55:11]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1309953003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1309953003/1

[commit-bot: I haz the power, 2015-09-10 01:30:18]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=202016

[commit-bot: I haz the power, 2015-09-23 12:06:06]

Patchset 1 (id:??) landed as
https://crrev.com/c9ebdc59e3e757dead4dad86efb729bf2ccd6d69