jni_generator: Pass object parameters as JavaParamRef.

android_webview/native/aw_web_contents_delegate.cc

Index: android_webview/native/aw_web_contents_delegate.cc
diff --git a/android_webview/native/aw_web_contents_delegate.cc b/android_webview/native/aw_web_contents_delegate.cc
index 1d22633c80a58b4502084ca41ece50e77d5cc780..e2a0b39d6ef8a5af560250418f4a1a2de8402567 100644
--- a/android_webview/native/aw_web_contents_delegate.cc
+++ b/android_webview/native/aw_web_contents_delegate.cc
@@ -252,11 +252,14 @@ bool AwWebContentsDelegate::IsFullscreenForTabOrPending(
   return is_fullscreen_;
 }
 
-
 static void FilesSelectedInChooser(
-    JNIEnv* env, jclass clazz,
-    jint process_id, jint render_id, jint mode_flags,
-    jobjectArray file_paths, jobjectArray display_names) {
+    JNIEnv* env,
+    const JavaParamRef<jclass>& clazz,
+    jint process_id,
+    jint render_id,
+    jint mode_flags,
+    const JavaParamRef<jobjectArray>& file_paths,
+    const JavaParamRef<jobjectArray>& display_names) {
   content::RenderViewHost* rvh = content::RenderViewHost::FromID(process_id,
                                                                  render_id);
   if (!rvh)