[427247] Remove DDiagramSpecOperations.validate

DDiagramSpecOperations.validate is dead code. (Oversight from
5a18836838090ae69a1f3cd6b9d5717d829d73ea commit)

Bug: 427247
Change-Id: I3347501a8f9a8f4659206ddd3f5f84e9bbae3486
Signed-off-by: Laurent Fasani <laurent.fasani@obeo.fr>
1 file changed