jni: Pass method parameters as JavaParamRef in content.

content/browser/android/background_sync_network_observer_android.h

Index: content/browser/android/background_sync_network_observer_android.h
diff --git a/content/browser/android/background_sync_network_observer_android.h b/content/browser/android/background_sync_network_observer_android.h
index 49e8b0ac9c8fb156daedea07d5dde3d8fe49f193..14c09f15ee71e8155bc61d3534a452cb4848a658 100644
--- a/content/browser/android/background_sync_network_observer_android.h
+++ b/content/browser/android/background_sync_network_observer_android.h
@@ -46,9 +46,10 @@ class BackgroundSyncNetworkObserverAndroid
     // connection type changes. This updates the current connection type seen by
     // this class and calls the |network_changed_callback| provided to the
     // constructor, on the IO thread, with the new connection type.
-    void NotifyConnectionTypeChanged(JNIEnv* env,
-                                     jobject jcaller,
-                                     jint new_connection_type);
+    void NotifyConnectionTypeChanged(
+        JNIEnv* env,
+        const base::android::JavaParamRef<jobject>& jcaller,
+        jint new_connection_type);
 
    private:
     friend struct BrowserThread::DeleteOnThread<BrowserThread::UI>;