Javadoc updates for NFC.

Change-Id: Ibd91829979576297599fbcc9eb8054924af1d527
diff --git a/core/java/android/app/ActivityThread.java b/core/java/android/app/ActivityThread.java
index e3fa32c..162d9eb 100644
--- a/core/java/android/app/ActivityThread.java
+++ b/core/java/android/app/ActivityThread.java
@@ -1439,6 +1439,16 @@
         }
     }
 
+    public void unregisterOnActivityPausedListener(Activity activity,
+            OnActivityPausedListener listener) {
+        synchronized (mOnPauseListeners) {
+            ArrayList<OnActivityPausedListener> list = mOnPauseListeners.get(activity);
+            if (list != null) {
+                list.remove(listener);
+            }
+        }
+    }
+
     public final ActivityInfo resolveActivityInfo(Intent intent) {
         ActivityInfo aInfo = intent.resolveActivityInfo(
                 mInitialApplication.getPackageManager(), PackageManager.GET_SHARED_LIBRARY_FILES);