jni_generator: Pass object parameters as JavaParamRef.

content/shell/browser/shell_android.cc

Index: content/shell/browser/shell_android.cc
diff --git a/content/shell/browser/shell_android.cc b/content/shell/browser/shell_android.cc
index 6139c8d25b900059231eabef929ad5d12f69530e..b1a2348dec3c632415109ea79c04fb17391705b2 100644
--- a/content/shell/browser/shell_android.cc
+++ b/content/shell/browser/shell_android.cc
@@ -104,7 +104,9 @@ bool Shell::Register(JNIEnv* env) {
 }
 
 // static
-void CloseShell(JNIEnv* env, jclass clazz, jlong shellPtr) {
+void CloseShell(JNIEnv* env,
+                const JavaParamRef<jclass>& clazz,
+                jlong shellPtr) {
   Shell* shell = reinterpret_cast<Shell*>(shellPtr);
   shell->Close();
 }