Cleanup the kernel service implementation and avoid printing on the console when no tracing flags a…

runtime/bin/main.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include <stdlib.h>
 #include <string.h>
 #include <stdio.h>
 
 #include "include/dart_api.h"
 #include "include/dart_tools_api.h"
@@ skipping 892 matching lines @@
   }
 
   // Setup package root if specified.
   result = DartUtils::SetupPackageRoot(package_root, packages_config);
   CHECK_RESULT(result);
 
   result = Dart_SetEnvironmentCallback(EnvironmentCallback);
   CHECK_RESULT(result);
 
   if (!Dart_IsKernelIsolate(isolate) && use_dart_frontend) {
-    Log::PrintErr("Waiting for Kernel isolate to load.\n");
     // This must be the main script to be loaded. Wait for Kernel isolate
     // to finish initialization.
     Dart_Port port = Dart_ServiceWaitForKernelPort();
     if (port == ILLEGAL_PORT) {
       *error = strdup("Error while initializing Kernel isolate");
       return NULL;
     }
   }
 
   if (run_app_snapshot) {
@@ skipping 1061 matching lines @@
   Platform::Exit(Process::GlobalExitCode());
 }
 
 }  // namespace bin
 }  // namespace dart
 
 int main(int argc, char** argv) {
   dart::bin::main(argc, argv);
   UNREACHABLE();
 }