Set the quiet shutdown flag

Set the quiet shutdown flag.

Currently |SSL_shutdown| is only called to avoid that the
session is marked as unresumable. Without the quiet flag the
close notify message is generated without being sent on the
network.

BUG=None

Committed: https://crrev.com/c80b0ee3708252814a0a20e795305ee2fc0ebc2f
Cr-Commit-Position: refs/heads/master@{#313887}

[haavardm, 2015-01-29 15:52:56]

haavardm@opera.com changed reviewers:
+ davidben@chromium.org, rsleevi@chromium.org

[haavardm, 2015-01-29 15:53:56]

David please review, 
Ryan FYI.

[davidben, 2015-01-29 21:44:03]

lgtm

[haavardm, 2015-01-30 08:22:48]

The CQ bit was checked by haavardm@opera.com

[commit-bot: I haz the power, 2015-01-30 08:23:27]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/885083002/20001

[commit-bot: I haz the power, 2015-01-30 09:16:34]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-01-30 09:18:00]

Patchset 2 (id:??) landed as
https://crrev.com/c80b0ee3708252814a0a20e795305ee2fc0ebc2f
Cr-Commit-Position: refs/heads/master@{#313887}