Dion Hulse 371db8aea1 Remove a redundant index drop, it'll be dropped and re-created a few lines further down.
Fixes a warning during updating from 4.0 or earlier.
Merges [32852] to the 4.2 branch. Fixes #31388 for 4.2

Built from https://develop.svn.wordpress.org/branches/4.2@32853


git-svn-id: http://core.svn.wordpress.org/branches/4.2@32824 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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