LibWeb: Clean up static function in header

'static' for a function means that the symbol shall not be made public
for the result of the current compilation unit. This does not make sense
in a header, especially not if it's a large function that is used in
more than one place and not that performance-sensitive.

Userland/Libraries/LibWeb/CMakeLists.txt

@@ -78,6 +78,7 @@ set(SOURCES
     DOM/Text.idl
     DOM/Timer.cpp
     DOM/Window.cpp
+    DOMParsing/InnerHTML.cpp
     DOMTreeModel.cpp
     Dump.cpp
     FontCache.cpp