Auto merge of #18056 - cynicaldevil:remove-treesink-dep-on-dom, r=nox

End TreeBuilder's reliance on DOM.

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Fixed h5e's TreeBuilder so that it does not use `same_tree` and `has_parent_node` methods: d8c2ea5cb6
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components/layout/Cargo.toml

@@ -19,7 +19,7 @@ fnv = "1.0"
 gfx = {path = "../gfx"}
 gfx_traits = {path = "../gfx_traits"}
 heapsize = "0.4"
-html5ever = "0.18"
+html5ever = "0.19"
 ipc-channel = "0.8"
 libc = "0.2"
 log = "0.3.5"