jni_generator: Make all object-returning natives return ScopedJavaLocalRef.

chrome/browser/ui/android/omnibox/omnibox_view_util.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 "chrome/browser/ui/android/omnibox/omnibox_view_util.h"
 
 #include "base/android/jni_string.h"
 #include "components/omnibox/browser/omnibox_view.h"
 #include "jni/OmniboxViewUtil_jni.h"
 
 // static
-jstring SanitizeTextForPaste(JNIEnv* env, jclass clazz, jstring jtext) {
+ScopedJavaLocalRef<jstring> SanitizeTextForPaste(JNIEnv* env,
+                                                 jclass clazz,
+                                                 jstring jtext) {
   base::string16 pasted_text(
       base::android::ConvertJavaStringToUTF16(env, jtext));
   pasted_text = OmniboxView::SanitizeTextForPaste(pasted_text);
-  return base::android::ConvertUTF16ToJavaString(env, pasted_text).Release();
+  return base::android::ConvertUTF16ToJavaString(env, pasted_text);
 }
 
 // static
 bool OmniboxViewUtil::RegisterOmniboxViewUtil(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }