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Preserve original data inside parameter objects too

Authored by Catrope.

Description

Preserve original data inside parameter objects too

Parsoid has added a "key" property to parameter objects,
so now we have to preserve that rather than regenerating
all parameter objects.

Do this by changing the existing use of this.originalData
to a deep extend.

Change-Id: Ib4d31c2e0f7b567da1a148b51c42e688a2590b8e
Bonus: avoid modifying this.originalData