Cleanup the getting and setting of the socket file descriptor

runtime/bin/process.cc

Index: runtime/bin/process.cc
diff --git a/runtime/bin/process.cc b/runtime/bin/process.cc
index 89c8028075e15c53c4c6e10fd1d13d5e2361066f..d7dd894636294bb87338b7590a32a6e67e2b623c 100644
--- a/runtime/bin/process.cc
+++ b/runtime/bin/process.cc
@@ -158,18 +158,14 @@ void FUNCTION_NAME(Process_Start)(Dart_NativeArguments args) {
 
 void FUNCTION_NAME(Process_Wait)(Dart_NativeArguments args) {
   Dart_Handle process =  Dart_GetNativeArgument(args, 0);
-  Dart_Handle stdin_handle =  Dart_GetNativeArgument(args, 1);
-  Dart_Handle stdout_handle =  Dart_GetNativeArgument(args, 2);
-  Dart_Handle stderr_handle =  Dart_GetNativeArgument(args, 3);
-  Dart_Handle exit_handle =  Dart_GetNativeArgument(args, 4);
-  intptr_t process_stdin;
-  intptr_t process_stdout;
-  intptr_t process_stderr;
-  intptr_t exit_event;
-  Socket::GetSocketIdNativeField(stdin_handle, &process_stdin);
-  Socket::GetSocketIdNativeField(stdout_handle, &process_stdout);
-  Socket::GetSocketIdNativeField(stderr_handle, &process_stderr);
-  Socket::GetSocketIdNativeField(exit_handle, &exit_event);
+  intptr_t process_stdin =
+      Socket::GetSocketIdNativeField(Dart_GetNativeArgument(args, 1));
+  intptr_t process_stdout =
+      Socket::GetSocketIdNativeField(Dart_GetNativeArgument(args, 2));
+  intptr_t process_stderr =
+      Socket::GetSocketIdNativeField(Dart_GetNativeArgument(args, 3));
+  intptr_t exit_event =
+      Socket::GetSocketIdNativeField(Dart_GetNativeArgument(args, 4));
   ProcessResult result;
   intptr_t pid;
   Process::GetProcessIdNativeField(process, &pid);