At the moment we have several classes to represent plugin extensions:
DynamicMap.Entry, DynamicSet.Entry, NamedProvider
They are all very similar and can be merged into one class. This has the
advantage that we are now able to offer methods that deal with plugin
extensions regardless from which source they come.
Change-Id: I4293795800771ef06eae6ec6d64be4b0a8fd72f4
Signed-off-by: Edwin Kempin <ekempin@google.com>