Remove a seemingly useless vector definition

[perrotta]

PR description:

The removed line in classes.h seems useless to me, but perhaps @lgray remembers why it wass added in #36037

PR validation:

Scram build gives no error

[cmsbuild]

+code-checks

Logs: https://cmssdt.cern.ch/SDT/code-checks/cms-sw-PR-40579/33826

• This PR adds an extra 12KB to repository

[cmsbuild]

A new Pull Request was created by @perrotta (Andrea Perrotta) for master.

It involves the following packages:

• DataFormats/NanoAOD (xpog)

@cmsbuild, @swertz, @vlimant can you please review it and eventually sign? Thanks.
@gpetruc, @missirol, @rovere this is something you requested to watch as well.
@perrotta, @dpiparo, @rappoccio you are the release manager for this.

cms-bot commands are listed here

[perrotta]

enable nano

[perrotta]

please test

[cmsbuild]

+1

Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-0cd85a/30095/summary.html
COMMIT: 9316042
CMSSW: CMSSW_13_0_X_2023-01-20-1100/el8_amd64_gcc11
Additional Tests: NANO
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week0/cms-sw/cmssw/40579/30095/install.sh to create a dev area with all the needed externals and cmssw changes.

Comparison Summary

Summary:

• No significant changes to the logs found
• Reco comparison results: 4 differences found in the comparisons
• DQMHistoTests: Total files compared: 49
• DQMHistoTests: Total histograms compared: 3555479
• DQMHistoTests: Total failures: 3
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 3555454
• DQMHistoTests: Total skipped: 22
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 48 files compared)
• Checked 211 log files, 162 edm output root files, 49 DQM output files
• TriggerResults: no differences found

NANO Comparison Summary

Summary:

• No significant changes to the logs found
• Reco comparison results: 0 differences found in the comparisons
• DQMHistoTests: Total files compared: 11
• DQMHistoTests: Total histograms compared: 10813
• DQMHistoTests: Total failures: 0
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 10813
• DQMHistoTests: Total skipped: 0
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 10 files compared)
• Checked 23 log files, 10 edm output root files, 11 DQM output files

Nano size comparison Summary:

Sample	kb/ev	ref kb/ev	diff kb/ev	ev/s/thd	ref ev/s/thd	diff rate	mem/thd	ref mem/thd
2500.31	2.229	2.229	0.000 ( +0.0% )	9.56	9.60	-0.4%	1.480	1.501
2500.311	2.319	2.319	0.000 ( +0.0% )	9.21	9.19	+0.1%	1.846	1.847
2500.312	2.273	2.273	0.000 ( +0.0% )	9.30	9.38	-0.8%	1.862	1.831
2500.33	1.095	1.095	0.000 ( +0.0% )	22.01	22.06	-0.2%	1.644	1.644
2500.331	1.390	1.390	0.000 ( +0.0% )	16.25	15.98	+1.7%	1.789	1.792
2500.332	1.321	1.321	0.000 ( +0.0% )	18.17	18.05	+0.6%	1.848	1.849
2500.401	2.135	2.135	0.000 ( +0.0% )	10.50	10.28	+2.1%	1.175	1.167
2500.501	1.708	1.708	0.000 ( +0.0% )	16.77	16.81	-0.2%	1.093	1.082
2500.511	1.120	1.120	0.000 ( +0.0% )	31.27	30.56	+2.3%	1.358	1.358
2500.601	2.048	2.048	0.000 ( +0.0% )	12.57	12.54	+0.2%	1.147	1.141

[swertz]

+1

(though I'd also be interested to hear from @lgray )

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next master IBs (tests are also fine). This pull request will now be reviewed by the release team before it's merged. @perrotta, @dpiparo, @rappoccio (and backports should be raised in the release meeting by the corresponding L2)

[perrotta]

+1