Merged revisions 1540732 via  git cherry-pick from
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  r1540732 | dkulp | 2013-11-11 09:05:07 -0500 (Mon, 11 Nov 2013) | 2 lines

  Finer grained locking in ExtensionManagerImpl, just lock on the extension being considered.

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Recording revisions 1540732 via  git from
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Blocking revisions 1540731,1540737 via  git from
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