[MERGE] Get rid of revision_history() call during copy_content_into.

[Aaron Bentley]

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Andrew Bennetts wrote:
> This removes a call to revision_history() that was occurring during a
> copy_content_into.  In particular this was affecting RemoteBranch.  This
> will penalise BzrBranch5 a little, but it's old enough that we probably
> don't mind.

bb:resubmit

This doesn't make sense to me.  If it's affecting any branches, it's
affecting RemoteBranch only, because it's optimized for each branch type.

Please optimize RemoteBranch instead of pessimizing Branch5.

Aaron
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