jni_generator: Make all object-returning natives return ScopedJavaLocalRef.

components/cronet/android/test/quic_test_server.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "quic_test_server.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
 #include "base/bind.h"
 #include "base/files/file_path.h"
@@ skipping 59 matching lines @@
       FROM_HERE, base::Bind(&ServeFilesFromDirectory, test_files_root));
 }
 
 void ShutdownQuicTestServer(JNIEnv* env, jclass /*jcaller*/) {
   DCHECK(!g_quic_server_thread->task_runner()->BelongsToCurrentThread());
   g_quic_server_thread->task_runner()->PostTask(
       FROM_HERE, base::Bind(&ShutdownOnServerThread));
   delete g_quic_server_thread;
 }
 
-jstring GetServerHost(JNIEnv* env, jclass /*jcaller*/) {
-  return base::android::ConvertUTF8ToJavaString(env, kServerHost).Release();
+ScopedJavaLocalRef<jstring> GetServerHost(JNIEnv* env, jclass /*jcaller*/) {
+  return base::android::ConvertUTF8ToJavaString(env, kServerHost);
 }
 
 int GetServerPort(JNIEnv* env, jclass /*jcaller*/) {
   return kServerPort;
 }
 
 bool RegisterQuicTestServer(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace cronet