LibHTML: Get rid of the style tree

We now create a layout tree directly from the DOM tree.
This way we don't actually lose text nodes ^)

Libraries/LibHTML/Layout/LayoutDocument.cpp

@@ -1,7 +1,7 @@
 #include <LibHTML/Layout/LayoutDocument.h>
 
-LayoutDocument::LayoutDocument(const Document& document, const StyledNode& styled_node)
-    : LayoutBlock(&document, &styled_node)
+LayoutDocument::LayoutDocument(const Document& document, StyleProperties&& style_properties)
+    : LayoutBlock(&document, move(style_properties))
 {
 }