[MERGE] Remove deprecated Repository.revision_parents().

[John Arbash Meinel]

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Jelmer Vernooij wrote:
| The attached patch removes Repository.revision_parents(). This function
| was already deprecated and the implementation relies on the
| get_parents() call in VersionedFile which was removed earlier.
|
| Cheers,
|
| Jelmer
|

I forgot

BB:approve


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