LibWeb: Rename `Window::open_impl()` to `Window::window_open_steps()`

This is the same name used in the specification.

Userland/Libraries/LibWeb/DOM/Document.cpp

@@ -680,7 +680,7 @@ WebIDL::ExceptionOr<JS::GCPtr<HTML::WindowProxy>> Document::open(StringView url,
         return WebIDL::InvalidAccessError::create(realm(), "Cannot perform open on a document that isn't fully active."_string);
 
     // 2. Return the result of running the window open steps with url, name, and features.
-    return window()->open_impl(url, name, features);
+    return window()->window_open_steps(url, name, features);
 }
 
 // https://html.spec.whatwg.org/multipage/dynamic-markup-insertion.html#closing-the-input-stream

Userland/Libraries/LibWeb/HTML/Window.cpp

@@ -139,7 +139,7 @@ void Window::finalize()
 Window::~Window() = default;
 
 // https://html.spec.whatwg.org/multipage/window-object.html#window-open-steps
-WebIDL::ExceptionOr<JS::GCPtr<WindowProxy>> Window::open_impl(StringView url, StringView target, StringView features)
+WebIDL::ExceptionOr<JS::GCPtr<WindowProxy>> Window::window_open_steps(StringView url, StringView target, StringView features)
 {
     // 1. If the event loop's termination nesting level is nonzero, return null.
     if (main_thread_event_loop().termination_nesting_level() != 0)
@@ -1007,7 +1007,7 @@ JS::GCPtr<DOM::Element const> Window::frame_element() const
 WebIDL::ExceptionOr<JS::GCPtr<WindowProxy>> Window::open(Optional<String> const& url, Optional<String> const& target, Optional<String> const& features)
 {
     // The open(url, target, features) method steps are to run the window open steps with url, target, and features.
-    return open_impl(*url, *target, *features);
+    return window_open_steps(*url, *target, *features);
 }
 
 // https://html.spec.whatwg.org/multipage/system-state.html#dom-navigator

Userland/Libraries/LibWeb/HTML/Window.h

@@ -101,7 +101,7 @@ public:
     bool import_maps_allowed() const { return m_import_maps_allowed; }
     void set_import_maps_allowed(bool import_maps_allowed) { m_import_maps_allowed = import_maps_allowed; }
 
-    WebIDL::ExceptionOr<JS::GCPtr<WindowProxy>> open_impl(StringView url, StringView target, StringView features);
+    WebIDL::ExceptionOr<JS::GCPtr<WindowProxy>> window_open_steps(StringView url, StringView target, StringView features);
     bool has_animation_frame_callbacks() const { return m_animation_frame_callback_driver.has_callbacks(); }
 
     DOM::Event* current_event() { return m_current_event.ptr(); }