Fix addRequestFinishedListener() documentation

components/cronet/android/api/src/org/chromium/net/CronetEngine.java

 // 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.
 
 package org.chromium.net;
 
 import android.annotation.SuppressLint;
 import android.content.Context;
 import android.net.http.HttpResponseCache;
 import android.support.annotation.IntDef;
@@ skipping 1152 matching lines @@
             // Leave as null.
         } catch (Exception e) {
             throw new IllegalStateException("Cannot instantiate: " + CRONET_URL_REQUEST_CONTEXT, e);
         }
         return cronetEngine;
     }
 
     /**
      * Registers a listener that gets called after the end of each request with the request info.
      *
-     * <p>This must be called after {@link #enableNetworkQualityEstimator} and will throw an
-     * exception otherwise.
-     *
-     * <p>The listener is called on the {@link java.util.concurrent.Executor} that
-     * is passed to {@link #enableNetworkQualityEstimator}.
+     * <p>The listener is called on an {@link java.util.concurrent.Executor} provided by the
+     * listener.
      *
      * @param listener the listener for finished requests.
      *
      * @hide as it's a prototype.
      */
     public abstract void addRequestFinishedListener(RequestFinishedInfo.Listener listener);
 
     /**
      * Removes a finished request listener.
      *
@@ skipping 12 matching lines @@
      *
      * @param url URL for the generated requests.
      * @param callback callback object that gets invoked on different events.
      * @param executor {@link Executor} on which all callbacks will be invoked.
      */
     public UrlRequest.Builder newUrlRequestBuilder(
             String url, UrlRequest.Callback callback, Executor executor) {
         return new UrlRequest.Builder(url, callback, executor, this);
     }
 }