There is logic in HTMLMediaElement around handling EME if we're suspending the element that is dead code[0]. This looks like it resulted from the 'Remove IsPrimetimeKeySystem(string) from Gecko.' patch in bug 1329543 that removed surrounding code. [0] https://searchfox.org/mozilla-central/rev/0c682c4f01442c3de0fa6cd286e9cadc8276b45f/dom/html/HTMLMediaElement.cpp#6511-6519
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HTMLMediaElement has suspend code to cover the EME case that no longer does anything[0]. This looks like it resulted from the 'Remove IsPrimetimeKeySystem(string) from Gecko.' patch in bug 1329543 that removed surrounding code. [0] https://searchfox.org/mozilla-central/rev/0c682c4f01442c3de0fa6cd286e9cadc8276b45f/dom/html/HTMLMediaElement.cpp#6511-6519