LibURL+LibWeb: Make URL::Origin default constructor private

Instead, porting over all users to use the newly created
Origin::create_opaque factory function. This also requires porting
over some users of Origin to avoid default construction.

Libraries/LibURL/Origin.cpp

@@ -10,6 +10,12 @@
 
 namespace URL {
 
+// FIXME: This should be generating a unique origin identifer that can be used for equality checks.
+Origin Origin::create_opaque()
+{
+    return Origin {};
+}
+
 // https://html.spec.whatwg.org/multipage/browsers.html#same-site
 bool Origin::is_same_site(Origin const& other) const
 {

Libraries/LibURL/Origin.h

@@ -15,10 +15,6 @@ namespace URL {
 
 class Origin {
 public:
-    // FIXME: This should be generating a unique origin identifer that can be used for equality checks.
-    //        Probably we should remove the default constructor, and instead expose this as a factory method.
-    Origin() = default;
-
     Origin(Optional<String> const& scheme, Host const& host, Optional<u16> port)
         : m_state(State {
               .scheme = scheme,
@@ -28,6 +24,8 @@ public:
     {
     }
 
+    static Origin create_opaque();
+
     // https://html.spec.whatwg.org/multipage/origin.html#concept-origin-opaque
     bool is_opaque() const { return !m_state.has_value(); }
 
@@ -102,6 +100,8 @@ public:
     bool operator==(Origin const& other) const { return is_same_origin(other); }
 
 private:
+    Origin() = default;
+
     struct State {
         Optional<String> scheme;
         Host host;

Libraries/LibURL/URL.cpp

@@ -345,14 +345,14 @@ Origin URL::origin() const
 
         // 3. If pathURL is failure, then return a new opaque origin.
         if (!path_url.has_value())
-            return Origin {};
+            return Origin::create_opaque();
 
         // 4. If pathURL’s scheme is "http", "https", or "file", then return pathURL’s origin.
         if (path_url->scheme().is_one_of("http"sv, "https"sv, "file"sv))
             return path_url->origin();
 
         // 5. Return a new opaque origin.
-        return Origin {};
+        return Origin::create_opaque();
     }
 
     // -> "ftp"
@@ -375,7 +375,7 @@ Origin URL::origin() const
 
     // -> Otherwise
     // Return a new opaque origin.
-    return Origin {};
+    return Origin::create_opaque();
 }
 
 bool URL::equals(URL const& other, ExcludeFragment exclude_fragments) const