LibWeb+WebContent: Remove PageClient::page_did_invalidate()

...and schedule repainting directly from Navigable::set_needs_display()
bypassing PageClient.

Userland/Libraries/LibWeb/HTML/Navigable.cpp

@@ -2033,7 +2033,7 @@ void Navigable::set_needs_display()
     set_needs_display(viewport_rect());
 }
 
-void Navigable::set_needs_display(CSSPixelRect const& rect)
+void Navigable::set_needs_display(CSSPixelRect const&)
 {
     // FIXME: Ignore updates outside the visible viewport rect.
     //        This requires accounting for fixed-position elements in the input rect, which we don't do yet.
@@ -2041,7 +2041,8 @@ void Navigable::set_needs_display(CSSPixelRect const& rect)
     m_needs_repaint = true;
 
     if (is<TraversableNavigable>(*this)) {
-        static_cast<TraversableNavigable*>(this)->page().client().page_did_invalidate(to_top_level_rect(rect));
+        // Schedule the main thread event loop, which will, in turn, schedule a repaint.
+        Web::HTML::main_thread_event_loop().schedule();
         return;
     }
 

Userland/Libraries/LibWeb/Page/Page.h

@@ -253,7 +253,6 @@ public:
     virtual void page_did_leave_tooltip_area() { }
     virtual void page_did_hover_link(const AK::URL&) { }
     virtual void page_did_unhover_link() { }
-    virtual void page_did_invalidate(CSSPixelRect const&) { }
     virtual void page_did_change_favicon(Gfx::Bitmap const&) { }
     virtual void page_did_layout() { }
     virtual void page_did_request_scroll(i32, i32) { }

Userland/Services/WebContent/PageClient.cpp

@@ -224,11 +224,6 @@ void PageClient::set_viewport_rect(Web::DevicePixelRect const& rect)
     page().top_level_traversable()->set_viewport_rect(page().device_to_css_rect(rect));
 }
 
-void PageClient::page_did_invalidate(Web::CSSPixelRect const&)
-{
-    Web::HTML::main_thread_event_loop().schedule();
-}
-
 void PageClient::page_did_request_cursor_change(Gfx::StandardCursor cursor)
 {
     client().async_did_request_cursor_change(m_id, (u32)cursor);

Userland/Services/WebContent/PageClient.h

@@ -88,7 +88,6 @@ private:
     virtual Gfx::Palette palette() const override;
     virtual Web::DevicePixelRect screen_rect() const override { return m_screen_rect; }
     virtual Web::CSS::PreferredColorScheme preferred_color_scheme() const override { return m_preferred_color_scheme; }
-    virtual void page_did_invalidate(Web::CSSPixelRect const&) override;
     virtual void page_did_request_cursor_change(Gfx::StandardCursor) override;
     virtual void page_did_layout() override;
     virtual void page_did_change_title(ByteString const&) override;