[tools] download traces only from non-resident runs (#3615)

packages/flutter_tools/lib/src/commands/run.dart

@@ -224,6 +224,8 @@ Future<int> startApp(
 
   if (!result.started)
     printError('Error running application on ${device.name}.');
+  else if (traceStartup)
+    await _downloadStartupTrace(result.observatoryPort, device);
 
   return result.started ? 0 : 2;
 }
@@ -318,9 +320,6 @@ Future<int> startAppStayResident(
     return 2;
   }
 
-  if (traceStartup)
-    await _downloadStartupTrace(debuggingOptions.observatoryPort, device);
-
   Completer<int> exitCompleter = new Completer<int>();
 
   void complete(int exitCode) {