LibWeb+LibJS: Move some code around to make CSS/Parser parse faster

This makes it possible to include fewer full definitions of things,
which makes the file about 30% faster to compile.

Userland/Libraries/LibWeb/HTML/Scripting/Environments.h

@@ -8,10 +8,7 @@
 #pragma once
 
 #include <AK/URL.h>
-#include <LibJS/Runtime/ExecutionContext.h>
-#include <LibJS/Runtime/GlobalObject.h>
-#include <LibJS/Runtime/Object.h>
-#include <LibJS/Runtime/Realm.h>
+#include <LibJS/Forward.h>
 #include <LibWeb/HTML/EventLoop/EventLoop.h>
 #include <LibWeb/HTML/Origin.h>
 #include <LibWeb/HTML/Scripting/ModuleMap.h>

Userland/Libraries/LibWeb/HTML/StructuredSerialize.cpp

@@ -8,6 +8,7 @@
 #include <AK/HashTable.h>
 #include <AK/Vector.h>
 #include <LibJS/Forward.h>
+#include <LibJS/Runtime/VM.h>
 #include <LibWeb/HTML/StructuredSerialize.h>
 #include <LibWeb/WebIDL/ExceptionOr.h>
 

Userland/Libraries/LibWeb/HTML/TraversableNavigable.cpp

@@ -4,6 +4,7 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
+#include <AK/QuickSort.h>
 #include <LibWeb/Bindings/MainThreadVM.h>
 #include <LibWeb/DOM/Document.h>
 #include <LibWeb/HTML/BrowsingContextGroup.h>