Code to abort the current demuxing operation can be found in the MediaPlayerPrivateWebM , the code was copied from the SourceBufferPrivateAVFObjC but is not used [1] `abort()` is only called in the destructor and so is redundant with simply testing that the weak pointer isn't null. [1] https://searchfox.org/wubkat/rev/9709f5c78a15a0ae1e723096557a6a060822d868/Source/WebCore/platform/graphics/cocoa/MediaPlayerPrivateWebM.mm#1140-1144
<rdar://problem/116652806>
Was fixed by bug 264847