Make ctors public, and remove unused argument

[wmtan]

Two constructors of TypeWithDict that should have been public were in fact private, just because they were not invoked from outside the class.
A carryover from 7_4_X in fireworks added the use of one of these ctor's, causing a compilation error and many link errors in fireworks.
Since there is no good reason for these ctor's not to be public, this pull request makes them public, thereby fixing the build errors.
The constructor not invoked from outside the class also had an unused argument removed, and the calls modified accordingly.
Please merge this pull request as soon as convenient.

[cmsbuild]

A new Pull Request was created by @wmtan for CMSSW_7_4_ROOT6_X.

Make ctors public, and remove unused argument

It involves the following packages:

FWCore/Utilities

@cmsbuild, @Dr15Jones, @ktf, @nclopezo can you please review it and eventually sign? Thanks.
@Martin-Grunewald, @wddgit this is something you requested to watch as well.
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