Avoid local methods in DocxTableStyleExport
Avoid local methods in DocxTableStyleExport

We already have DocxTableStyleExport::Impl, use that instead of passing
around the serializer with no good reason.

Change-Id: I8cc47c34201219c4102c5edb21bcc1455da48ff4

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