This change spreads the fact that CALLBACKs may contain transitions all
over the
place. I think it would make more sense to let CopyFrom() do the
transition-dropping. I wouldn't even rename that function, just add a
comment
explaining that it will drop all transitions while copying.
It makes no sense to have a CopyFrom() which does not drop transitions,
because
that will destroy the tree-property of our transition tree in almost all
cases.
And it also makes a separate GetDescriptorWithoutTransitions() obsolete.
https://chromiumcodereview.appspot.com/9372023/
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