LibHTML: Rename Document::normalize() to fixup() and always do it

Node.normalize() is a standard DOM API that coalesces Text nodes.
To avoid clashing with that, rename it to fixup().

This patch also makes it happen automagically as part of parsing.

Applications/Help/main.cpp

@@ -81,7 +81,6 @@ int main(int argc, char* argv[])
 
         String html = md_document.render_to_html();
         auto html_document = parse_html(html);
-        html_document->normalize();
         html_view->set_document(html_document);
 
         String page_and_section = model->page_and_section(tree_view->selection().first());

Libraries/LibHTML/DOM/Document.cpp

@@ -27,7 +27,7 @@ StyleResolver& Document::style_resolver()
     return *m_style_resolver;
 }
 
-void Document::normalize()
+void Document::fixup()
 {
     if (is<HTMLHtmlElement>(first_child()))
         return;

Libraries/LibHTML/DOM/Document.h

@@ -28,7 +28,7 @@ public:
 
     URL complete_url(const String&) const;
 
-    void normalize();
+    void fixup();
 
     StyleResolver& style_resolver();
 

Libraries/LibHTML/HtmlView.cpp

@@ -182,7 +182,6 @@ void HtmlView::load(const URL& url)
         }
 
         auto document = parse_html(data, url);
-        document->normalize();
 
         set_document(document);
 

Libraries/LibHTML/Parser/HTMLParser.cpp

@@ -309,5 +309,7 @@ NonnullRefPtr<Document> parse_html(const StringView& html, const URL& url)
 
     fire_insertion_callbacks(*document);
 
+    document->fixup();
+
     return document;
 }

Userland/html.cpp

@@ -35,7 +35,6 @@ int main(int argc, char** argv)
 
     String html = String::copy(f->read_all());
     auto document = parse_html(html);
-    document->normalize();
 
     auto window = GWindow::construct();
     auto widget = HtmlView::construct();