Revert "Merge pull request #3836 from leggat/threadSafe"

[ktf]

This reverts commit f971fa9, reversing
changes made to 406887d.

[deguio]

@ktf
thanks!
F.

[cmsbuild]

A new Pull Request was created by @ktf (Giulio Eulisse) for CMSSW_7_1_X.

Revert "Merge pull request #3836 from leggat/threadSafe"

It involves the following packages:

DQM/SiPixelMonitorCluster
DQM/SiPixelMonitorDigi
DQM/SiPixelMonitorRawData
DQM/SiPixelMonitorRecHit
DQM/SiPixelMonitorTrack

@ojeda, @danduggan, @rovere, @cmsbuild, @nclopezo, @deguio, @Degano can you please review it and eventually sign? Thanks.
@threus this is something you requested to watch as well.
You can sign-off by replying to this message having '+1' in the first line of your reply.
You can reject by replying to this message having '-1' in the first line of your reply.
@nclopezo, @ktf you are the release manager for this.
You can merge this pull request by typing 'merge' in the first line of your comment.