Makoto Kato b04d5091db Bug 1388638 - Use RAII class for StartBatchChanges/EndBatchChanges. r=masayuki
CompositionTransaction forgets to call EndBatchChanges when GetSelectionController returns error, so we should use RAII class instead.

MozReview-Commit-ID: HI9kutRVzx6

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extra : rebase_source : d276f4349c5a64d4610581ae1a76d160841f7d7b
2017-08-09 18:06:36 +09:00
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