The Linux WebKit builds are broken since https://trac.webkit.org/changeset/242776/webkit . I think (https://build.webkit.org/builders/GTK%20Linux%2064-bit%20Debug%20%28Build%29/builds/19767/steps/compile-webkit/logs/stdio) it's just a missing #include <wtf/RefPtr.h> in Source/WebCore/platform/graphics/gstreamer/eme/WebKitClearKeyDecryptorGStreamer.cpp.
Created attachment 364375 [details] Patch
Comment on attachment 364375 [details] Patch Clearing flags on attachment: 364375 Committed r242790: <https://trac.webkit.org/changeset/242790>
All reviewed patches have been landed. Closing bug.
<rdar://problem/48803634>