sorted_vector should not inherit public std::vector
sorted_vector should not inherit public std::vector

Clearly we don't want to expose std::vector<Value>::insert here, and
neither e.g. push_back.

Change-Id: I89917a23d6d9f36f56474cdc361ba4d513516122

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