LibWeb: Abstract the LibProtocol ResourceLoader connection

This is the final component that required LibProtocol as a dependency
of LibWeb. With this, we can now remove the dependency, and LibWeb no
longer requires IPC to work :^)

Userland/Applications/Browser/main.cpp

@@ -23,6 +23,8 @@
 #include <LibGUI/Icon.h>
 #include <LibGUI/TabWidget.h>
 #include <LibMain/Main.h>
+#include <LibWeb/Loader/ResourceLoader.h>
+#include <LibWebView/RequestServerAdapter.h>
 #include <unistd.h>
 
 namespace Browser {
@@ -87,6 +89,8 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
     TRY(Core::System::unveil("/bin/BrowserSettings", "x"));
     TRY(Core::System::unveil(nullptr, nullptr));
 
+    Web::ResourceLoader::initialize(TRY(WebView::RequestServerAdapter::try_create()));
+
     auto app_icon = GUI::Icon::default_icon("app-browser");
 
     Browser::g_home_url = Config::read_string("Browser", "Preferences", "Home", "file:///res/html/misc/welcome.html");