jni_generator: Make all object-returning natives return ScopedJavaLocalRef.

components/cronet/android/chromium_url_request_context.cc

 // Copyright 2014 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 "components/cronet/android/chromium_url_request_context.h"
 
 #include <string>
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
@@ skipping 99 matching lines @@
   context_adapter->Release();
 }
 
 // Starts recording statistics.
 static void InitializeStatistics(JNIEnv* env, jobject jcaller) {
   base::StatisticsRecorder::Initialize();
 }
 
 // Gets current statistics with |jfilter| as a substring as JSON text (an empty
 // |jfilter| will include all registered histograms).
-static jstring GetStatisticsJSON(JNIEnv* env,
-                                 jobject jcaller,
-                                 jstring jfilter) {
+static ScopedJavaLocalRef<jstring> GetStatisticsJSON(JNIEnv* env,
+                                                     jobject jcaller,
+                                                     jstring jfilter) {
   std::string query = ConvertJavaStringToUTF8(env, jfilter);
   std::string json = base::StatisticsRecorder::ToJSON(query);
-  return ConvertUTF8ToJavaString(env, json).Release();
+  return ConvertUTF8ToJavaString(env, json);
 }
 
 // Starts recording NetLog into file with |jfilename|.
 static void StartNetLogToFile(JNIEnv* env,
                               jobject jcaller,
                               jlong jurl_request_context_adapter,
                               jstring jfilename,
                               jboolean jlog_all) {
   URLRequestContextAdapter* context_adapter =
       reinterpret_cast<URLRequestContextAdapter*>(jurl_request_context_adapter);
@@ skipping 13 matching lines @@
 // Called on application's main Java thread.
 static void InitRequestContextOnMainThread(JNIEnv* env,
                                            jobject jcaller,
                                            jlong jurl_request_context_adapter) {
   URLRequestContextAdapter* context_adapter =
       reinterpret_cast<URLRequestContextAdapter*>(jurl_request_context_adapter);
   context_adapter->InitRequestContextOnMainThread();
 }
 
 }  // namespace cronet