Merged revision 843323: Fix the deterministic leak on websites such as google maps (and some other ones) which also causes an assertion failure on exit. There is still a more subtle one where the conservative collection keeps an object alive for a while. Happens e.g. for #164126. That one needs more thought... CCBUG:156172 CCBUG:161289 CCBUG:151453 BUG:167354
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