jni_generator: Pass object parameters as JavaParamRef.

sync/test/fake_server/android/fake_server_helper_android.cc

Index: sync/test/fake_server/android/fake_server_helper_android.cc
diff --git a/sync/test/fake_server/android/fake_server_helper_android.cc b/sync/test/fake_server/android/fake_server_helper_android.cc
index 18539ff46ea60e3ee9c6654312cf50c980f0d4bf..42542951bf7840e6a938de5e7978192f18ef56c3 100644
--- a/sync/test/fake_server/android/fake_server_helper_android.cc
+++ b/sync/test/fake_server/android/fake_server_helper_android.cc
@@ -30,7 +30,7 @@ FakeServerHelperAndroid::FakeServerHelperAndroid(JNIEnv* env, jobject obj) {
 
 FakeServerHelperAndroid::~FakeServerHelperAndroid() { }
 
-static jlong Init(JNIEnv* env, jobject obj) {
+static jlong Init(JNIEnv* env, const JavaParamRef<jobject>& obj) {
   FakeServerHelperAndroid* fake_server_android =
       new FakeServerHelperAndroid(env, obj);
   return reinterpret_cast<intptr_t>(fake_server_android);