jni_generator: Pass object parameters as JavaParamRef.

components/dom_distiller/core/distilled_page_prefs_android.cc

Index: components/dom_distiller/core/distilled_page_prefs_android.cc
diff --git a/components/dom_distiller/core/distilled_page_prefs_android.cc b/components/dom_distiller/core/distilled_page_prefs_android.cc
index 051d821c2e4ca8de1388efb579659f40cbe52b4d..50adbd0dc83b8f6f28f2bc8878d28fc3402e3e43 100644
--- a/components/dom_distiller/core/distilled_page_prefs_android.cc
+++ b/components/dom_distiller/core/distilled_page_prefs_android.cc
@@ -42,7 +42,9 @@ jint DistilledPagePrefsAndroid::GetTheme(JNIEnv* env, jobject obj) {
   return (int) distilled_page_prefs_->GetTheme();
 }
 
-jlong Init(JNIEnv* env, jobject obj, jlong distilled_page_prefs_ptr) {
+jlong Init(JNIEnv* env,
+           const JavaParamRef<jobject>& obj,
+           jlong distilled_page_prefs_ptr) {
   DistilledPagePrefs* distilled_page_prefs =
       reinterpret_cast<DistilledPagePrefs*>(distilled_page_prefs_ptr);
   DistilledPagePrefsAndroid* distilled_page_prefs_android =
@@ -97,7 +99,7 @@ void DistilledPagePrefsObserverAndroid::OnChangeTheme(
       env, java_ref_.obj(), (int)new_theme);
 }
 
-jlong InitObserverAndroid(JNIEnv* env, jobject obj) {
+jlong InitObserverAndroid(JNIEnv* env, const JavaParamRef<jobject>& obj) {
   DistilledPagePrefsObserverAndroid* observer_android =
       new DistilledPagePrefsObserverAndroid(env, obj);
   return reinterpret_cast<intptr_t>(observer_android);