Remove links_recently_updated_time (hardening).

Merges some of [27916] to the 3.8 branch.

props Tom Adams.
see #27649.

Built from https://develop.svn.wordpress.org/branches/3.8@27917


git-svn-id: http://core.svn.wordpress.org/branches/3.8@27747 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Update Plupload Silverlight binary to 1.5.8 in the 3.8 branch.

Built from https://develop.svn.wordpress.org/branches/3.8@27920


git-svn-id: http://core.svn.wordpress.org/branches/3.8@27750 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Background Updates: Record plugin & theme update statistics like we do for core updates.

Pass plugin/theme update objects into the Background updater for consistency with core & translations.

Merges [27905] to the 3.8 branch.

props dd32.
fixes #27633.

Built from https://develop.svn.wordpress.org/branches/3.8@27923


git-svn-id: http://core.svn.wordpress.org/branches/3.8@27753 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Background Updates: Fix a PHP Warning caused by a Upgrader instance being passed into the Theme & Plugin $extra_stats parameter.
Background Updates: Fix two variable typos in r27905

Merges [27906], [27928] to the 3.8 branch.
Fixes #27633.

Built from https://develop.svn.wordpress.org/branches/3.8@27929


git-svn-id: http://core.svn.wordpress.org/branches/3.8@27759 1a063a9b-81f0-0310-95a4-ce76da25c4cd