Seems to be unused in C++ and not implemented by JS.
There are no JS implementations that I can see, but this will get us nicer bisectability if it turns out I'm wrong.
Attachment #8983184 - Flags: review?(dtownsend)
Assignee: nobody → bzbarsky
Status: NEW → ASSIGNED
Attachment #8983184 - Flags: review?(dtownsend) → review+
Attachment #8983186 - Flags: review?(dtownsend) → review+
Pushed by firstname.lastname@example.org: https://hg.mozilla.org/integration/mozilla-inbound/rev/189125be1c9b part 1. Mark nsITreeContentView builtinclass. r=mossop https://hg.mozilla.org/integration/mozilla-inbound/rev/cc5f600eebd6 part 2. Remove nsITreeContentView. r=mosssop
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