jni_generator: Make all object-returning natives return ScopedJavaLocalRef.

chrome/browser/android/download/chrome_download_delegate.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 "chrome/browser/android/download/chrome_download_delegate.h"
 
 #include <jni.h>
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
 #include "base/android/scoped_java_ref.h"
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/files/file_path.h"
 #include "base/memory/weak_ptr.h"
 #include "chrome/browser/android/download/android_download_manager_overwrite_infobar_delegate.h"
 #include "chrome/browser/android/tab_android.h"
 #include "chrome/browser/download/download_extensions.h"
 #include "chrome/browser/infobars/infobar_service.h"
 #include "chrome/grit/generated_resources.h"
 #include "content/public/browser/android/download_controller_android.h"
 #include "jni/ChromeDownloadDelegate_jni.h"
 #include "ui/base/l10n/l10n_util.h"
 
 // Gets the download warning text for the given file name.
-static jstring GetDownloadWarningText(
-    JNIEnv* env, jclass clazz, jstring filename) {
+static ScopedJavaLocalRef<jstring> GetDownloadWarningText(JNIEnv* env,
+                                                          jclass clazz,
+                                                          jstring filename) {
   return base::android::ConvertUTF8ToJavaString(
       env, l10n_util::GetStringFUTF8(
-          IDS_PROMPT_DANGEROUS_DOWNLOAD,
-          base::android::ConvertJavaStringToUTF16(env, filename))).Release();
+               IDS_PROMPT_DANGEROUS_DOWNLOAD,
+               base::android::ConvertJavaStringToUTF16(env, filename)));
 }
 
 // Returns true if a file name is dangerous, or false otherwise.
 static jboolean IsDownloadDangerous(
     JNIEnv* env, jclass clazz, jstring filename) {
   base::FilePath path(base::android::ConvertJavaStringToUTF8(env, filename));
   return download_util::GetFileDangerLevel(path) !=
       download_util::NOT_DANGEROUS;
 }
 
@@ skipping 35 matching lines @@
       base::android::ConvertJavaStringToUTF8(env, jdir_full_path);
 
   chrome::android::AndroidDownloadManagerOverwriteInfoBarDelegate::Create(
       InfoBarService::FromWebContents(tab_android->web_contents()), file_name,
       dir_name, dir_full_path, delegate, download_info);
 }
 
 bool RegisterChromeDownloadDelegate(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }