Ryan Hunt 1966a0614d Remove BeginPaintBuffer (bug 1409871 part 18, r=nical)
Now that BeginPaintBuffer and BeginPaint are both implemented by content client,
I think it makes sense to just merge them into one method. This simplifies the
interface clients have to use.

MozReview-Commit-ID: 8bjH6WcpZS9

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extra : rebase_source : 1b22549c03299e1b1b9ba8a04f3c3e428577e062
2017-10-18 15:20:14 -04:00
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