Clean up forward declarations in Source/modules

Source/modules/serviceworkers/ServiceWorkerClients.h

Index: Source/modules/serviceworkers/ServiceWorkerClients.h
diff --git a/Source/modules/serviceworkers/ServiceWorkerClients.h b/Source/modules/serviceworkers/ServiceWorkerClients.h
index fab24c4738d8392cffcaecedd1f61852a92e9bb2..71206fdf0a98014b93363a9a836808942d27cad7 100644
--- a/Source/modules/serviceworkers/ServiceWorkerClients.h
+++ b/Source/modules/serviceworkers/ServiceWorkerClients.h
@@ -7,16 +7,12 @@
 
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "modules/serviceworkers/ServiceWorkerClientQueryOptions.h"
-#include "platform/heap/Handle.h"
 #include "public/platform/WebServiceWorkerClientsInfo.h"
-#include "wtf/Forward.h"
 
 namespace blink {
 
-class ExecutionContext;
 class ScriptPromise;
 class ScriptState;
-class ServiceWorkerClient;
 
 class ServiceWorkerClients final : public GarbageCollected<ServiceWorkerClients>, public ScriptWrappable {
     DEFINE_WRAPPERTYPEINFO();