This fix build error with MEDIA_STREAM=OFF due to "error: 'm_pipeline' was not declared in this scope"
Pull request: https://github.com/WebKit/WebKit/pull/10640
Committed 260843@main (f86d288403ee): <https://commits.webkit.org/260843@main> Reviewed commits have been landed. Closing PR #10640 and removing active labels.
<rdar://problem/105930882>