Move this Singleton class to anonymous namespace.
Move this Singleton class to anonymous namespace.

If you add more Singleton classes into framework namespace,
it builds without any warning but I was not able to see menu text
labels.
Luckily UICommandDescription is involved in this and the problem was not
hidden somewhere else.

Change-Id: Iba0c06c2e31ae509579f31308d9f45f0cb9f654f

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core