Remove duplicate function productHistoryRegistryUpdate()

[wmtan]

I noticed that class InputSource had two different member functions that were identical except for the function name. There is no good reason for this, and it may be confusing. So, I removed productHistoryRegistryUpdate(), which was called in fewer places than productHistoryRegistryForUpdate(), and replaced its usage. The function need not be public.
This PR is fairly trivial.
If the DQM L2 does not respond in a timely manner, I suggest that the DQM signature be bypassed, as there are no functional changes to DQM.

[cmsbuild]

A new Pull Request was created by @wmtan for CMSSW_7_5_X.

Remove duplicate function productHistoryRegistryUpdate()

It involves the following packages:

DQMServices/FwkIO
FWCore/Framework
IOPool/Input
IOPool/Streamer

@cmsbuild, @danduggan, @Dr15Jones, @deguio, @nclopezo can you please review it and eventually sign? Thanks.
@Martin-Grunewald, @barvic, @wddgit 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.
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@nclopezo you are the release manager for this.
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[Dr15Jones]

Please test

[Dr15Jones]

+1

[cmsbuild]

The tests are being triggered in jenkins.

[deguio]

+1

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_5_X IBs unless changes (tests are also fine). This pull request requires discussion in the ORP meeting before it's merged. @davidlange6, @nclopezo, @smuzaffar

[davidlange6]

+1