Userland+Ladybird: Always specify url to be about:srcdoc in load_html()

After moving to navigables, we started reusing the code that populates
session history entries with the srcdoc attribute value from iframes
in `Page::load_html()` for loading HTML.

This change addresses a crash in `determine_the_origin` which occurred
because this method expected the URL to be `about:srcdoc` if we also
provided HTML content (previously, it was the URL passed along with the
HTML content into `load_html()`).

Ladybird/AppKit/UI/LadybirdWebView.h

@@ -40,7 +40,7 @@
 - (instancetype)init:(id<LadybirdWebViewObserver>)observer;
 
 - (void)loadURL:(URL const&)url;
-- (void)loadHTML:(StringView)html url:(URL const&)url;
+- (void)loadHTML:(StringView)html;
 
 - (WebView::ViewImplementation&)view;
 - (String const&)handle;

Ladybird/AppKit/UI/LadybirdWebView.mm

@@ -109,9 +109,9 @@ struct HideCursor {
     m_web_view_bridge->load(url);
 }
 
-- (void)loadHTML:(StringView)html url:(URL const&)url
+- (void)loadHTML:(StringView)html
 {
-    m_web_view_bridge->load_html(html, url);
+    m_web_view_bridge->load_html(html);
 }
 
 - (WebView::ViewImplementation&)view

Ladybird/AppKit/UI/TabController.mm

@@ -91,7 +91,7 @@ enum class IsHistoryNavigation {
 
 - (void)loadHTML:(StringView)html url:(URL const&)url
 {
-    [[self tab].web_view loadHTML:html url:url];
+    [[self tab].web_view loadHTML:html];
 }
 
 - (void)onLoadStart:(URL const&)url isRedirect:(BOOL)isRedirect

Ladybird/Qt/BrowserWindow.cpp

@@ -442,10 +442,10 @@ Tab& BrowserWindow::new_tab(QString const& url, Web::HTML::ActivateTab activate_
     return tab;
 }
 
-Tab& BrowserWindow::new_tab(StringView html, URL const& url, Web::HTML::ActivateTab activate_tab)
+Tab& BrowserWindow::new_tab(StringView html, Web::HTML::ActivateTab activate_tab)
 {
     auto& tab = create_new_tab(activate_tab);
-    tab.load_html(html, url);
+    tab.load_html(html);
     return tab;
 }
 

Ladybird/Qt/BrowserWindow.h

@@ -70,7 +70,7 @@ public slots:
     void tab_title_changed(int index, QString const&);
     void tab_favicon_changed(int index, QIcon const& icon);
     Tab& new_tab(QString const&, Web::HTML::ActivateTab);
-    Tab& new_tab(StringView html, URL const& url, Web::HTML::ActivateTab);
+    Tab& new_tab(StringView html, Web::HTML::ActivateTab);
     void activate_tab(int index);
     void close_tab(int index);
     void close_current_tab();

Ladybird/Qt/Tab.cpp

@@ -217,7 +217,7 @@ Tab::Tab(BrowserWindow* window, StringView webdriver_content_ipc_path, WebView::
 
     view().on_received_source = [this](auto const& url, auto const& source) {
         auto html = WebView::highlight_source(url, source);
-        m_window->new_tab(html, url, Web::HTML::ActivateTab::Yes);
+        m_window->new_tab(html, Web::HTML::ActivateTab::Yes);
     };
 
     view().on_navigate_back = [this]() {
@@ -550,9 +550,9 @@ void Tab::navigate(QString url_qstring)
     view().load(url_string);
 }
 
-void Tab::load_html(StringView html, URL const& url)
+void Tab::load_html(StringView html)
 {
-    view().load_html(html, url);
+    view().load_html(html);
 }
 
 void Tab::back()

Ladybird/Qt/Tab.h

@@ -34,7 +34,7 @@ public:
     WebContentView& view() { return *m_view; }
 
     void navigate(QString);
-    void load_html(StringView, URL const&);
+    void load_html(StringView);
 
     void back();
     void forward();