RequestServer: Replace Result<T, E> use with ErrorOr<T>

Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/01a6a4f7c4f

Userland/Services/RequestServer/Protocol.cpp

@@ -35,13 +35,13 @@ Protocol::~Protocol()
     VERIFY_NOT_REACHED();
 }
 
-Result<Protocol::Pipe, String> Protocol::get_pipe_for_request()
+ErrorOr<Protocol::Pipe> Protocol::get_pipe_for_request()
 {
     int fd_pair[2] { 0 };
     if (pipe(fd_pair) != 0) {
         auto saved_errno = errno;
         dbgln("Protocol: pipe() failed: {}", strerror(saved_errno));
-        return String { strerror(saved_errno) };
+        return Error::from_errno(saved_errno);
     }
     fcntl(fd_pair[1], F_SETFL, fcntl(fd_pair[1], F_GETFL) | O_NONBLOCK);
     return Pipe { fd_pair[0], fd_pair[1] };

Userland/Services/RequestServer/Protocol.h

@@ -7,7 +7,6 @@
 #pragma once
 
 #include <AK/RefPtr.h>
-#include <AK/Result.h>
 #include <AK/URL.h>
 #include <RequestServer/Forward.h>
 
@@ -28,7 +27,7 @@ protected:
         int read_fd { -1 };
         int write_fd { -1 };
     };
-    static Result<Pipe, String> get_pipe_for_request();
+    static ErrorOr<Pipe> get_pipe_for_request();
 
 private:
     String m_name;