L. David Baron f56a065e7d Bug 1353187 - Give frame properties the const-ness semantics of member variables. r=dholbert
This makes it so that, given a |const nsIFrame*|, a caller can retrieve
properties but not set or remove them, but with an |nsIFrame*| all
operations are allowed.  I believe this is sensible since properties act
as extended member variables for things that are needed rarely, and
these are the const-ness semantics of member variables.

This also avoids the need for const_cast<nsIFrame*> to cast away const
in the following patch, which guards property access with a frame state
bit.

MozReview-Commit-ID: IJ9JnGzdH51

--HG--
extra : transplant_source : %D4%DF%04%91_q%E6%CF%B3N%82%2C%A5%CB0%3A%B6%810%ED
2017-04-04 20:59:21 -07:00
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