Userland: Disambiguate dependent types

Clang produced an error on these pieces of code without the `typename`
keyword.

Userland/Libraries/LibIPC/ClientConnection.h

@@ -22,7 +22,7 @@ class ClientConnection : public Connection<ServerEndpoint, ClientEndpoint>
     , public ClientEndpoint::template Proxy<ServerEndpoint> {
 public:
     using ServerStub = typename ServerEndpoint::Stub;
-    using IPCProxy = ClientEndpoint::template Proxy<ServerEndpoint>;
+    using IPCProxy = typename ClientEndpoint::template Proxy<ServerEndpoint>;
 
     ClientConnection(ServerStub& stub, NonnullRefPtr<Core::LocalSocket> socket, int client_id)
         : IPC::Connection<ServerEndpoint, ClientEndpoint>(stub, move(socket))

Userland/Libraries/LibIPC/ServerConnection.h

@@ -16,7 +16,7 @@ class ServerConnection : public IPC::Connection<ClientEndpoint, ServerEndpoint>
     , public ServerEndpoint::template Proxy<ClientEndpoint> {
 public:
     using ClientStub = typename ClientEndpoint::Stub;
-    using IPCProxy = ServerEndpoint::template Proxy<ClientEndpoint>;
+    using IPCProxy = typename ServerEndpoint::template Proxy<ClientEndpoint>;
 
     ServerConnection(ClientStub& local_endpoint, const StringView& address)
         : Connection<ClientEndpoint, ServerEndpoint>(local_endpoint, Core::LocalSocket::construct())

Userland/Services/RequestServer/HttpCommon.h

@@ -55,8 +55,8 @@ void init(TSelf* self, TJob job)
 template<typename TBadgedProtocol, typename TPipeResult>
 OwnPtr<Request> start_request(TBadgedProtocol&& protocol, ClientConnection& client, const String& method, const URL& url, const HashMap<String, String>& headers, ReadonlyBytes body, TPipeResult&& pipe_result)
 {
-    using TJob = TBadgedProtocol::Type::JobType;
-    using TRequest = TBadgedProtocol::Type::RequestType;
+    using TJob = typename TBadgedProtocol::Type::JobType;
+    using TRequest = typename TBadgedProtocol::Type::RequestType;
 
     if (pipe_result.is_error()) {
         return {};