Revert of jni_generator: Make all object-returning natives return ScopedJavaLocalRef.

android_webview/native/aw_settings.cc

Index: android_webview/native/aw_settings.cc
diff --git a/android_webview/native/aw_settings.cc b/android_webview/native/aw_settings.cc
index a5ae993bc71502b1c1baba606e3a3b09c0f2a18d..c0674f511b00f3369a5f0a27772abafbff89382d 100644
--- a/android_webview/native/aw_settings.cc
+++ b/android_webview/native/aw_settings.cc
@@ -429,9 +429,8 @@
   return reinterpret_cast<intptr_t>(settings);
 }
 
-static ScopedJavaLocalRef<jstring> GetDefaultUserAgent(JNIEnv* env,
-                                                       jclass clazz) {
-  return base::android::ConvertUTF8ToJavaString(env, GetUserAgent());
+static jstring GetDefaultUserAgent(JNIEnv* env, jclass clazz) {
+  return base::android::ConvertUTF8ToJavaString(env, GetUserAgent()).Release();
 }
 
 bool RegisterAwSettings(JNIEnv* env) {