jni: Pass method parameters as JavaParamRef in content.

content/browser/android/background_sync_network_observer_android.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_ANDROID_BACKGROUND_SYNC_NETWORK_OBSERVER_ANDROID_H_
 #define CONTENT_BROWSER_ANDROID_BACKGROUND_SYNC_NETWORK_OBSERVER_ANDROID_H_
 
 #include "base/android/jni_android.h"
 #include "base/android/scoped_java_ref.h"
 #include "base/memory/weak_ptr.h"
@@ skipping 28 matching lines @@
     static scoped_refptr<BackgroundSyncNetworkObserverAndroid::Observer> Create(
         base::Callback<void(net::NetworkChangeNotifier::ConnectionType)>
             callback);
 
     static bool RegisterNetworkObserver(JNIEnv* env);
 
     // Called from BackgroundSyncNetworkObserver.java over JNI whenever the
     // 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>;
     friend class base::DeleteHelper<
         BackgroundSyncNetworkObserverAndroid::Observer>;
 
     Observer(base::Callback<void(net::NetworkChangeNotifier::ConnectionType)>
                  callback);
     void Init();
     ~Observer();
 
     // This callback is to be run on the IO thread whenever the connection type
     // changes.
     base::Callback<void(net::NetworkChangeNotifier::ConnectionType)> callback_;
     base::android::ScopedJavaGlobalRef<jobject> j_observer_;
 
     DISALLOW_COPY_AND_ASSIGN(Observer);
   };
 
  private:
   // Accessed on UI Thread
   scoped_refptr<Observer> observer_;
 
   base::WeakPtrFactory<BackgroundSyncNetworkObserverAndroid> weak_ptr_factory_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_ANDROID_BACKGROUND_SYNC_NETWORK_OBSERVER_ANDROID_H_