[Cronet] Leak NetLog instance used by CronetUrlRequestContextAdapter

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.content.Context;
 import android.support.annotation.IntDef;
 import android.support.annotation.Nullable;
 import android.util.Log;
@@ skipping 710 matching lines @@
      * otherwise throws an exception.
      *
      * Cannot be called on network thread - the thread Cronet calls into
      * Executor on (which is different from the thread the Executor invokes
      * callbacks on). May block until all the {@code CronetEngine}'s
      * resources have been cleaned up.
      */
     public abstract void shutdown();
 
     /**
-     * Starts NetLog logging to a file. The NetLog is useful for debugging.
+     * Starts NetLog logging to a file. The NetLog will contain events emitted
+     * by all live CronetEngines. The NetLog is useful for debugging.
      * The file can be viewed using a Chrome browser navigated to
      * chrome://net-internals/#import
      * @param fileName the complete file path. It must not be empty. If the file
      *            exists, it is truncated before starting. If actively logging,
      *            this method is ignored.
      * @param logAll {@code true} to include basic events, user cookies,
      *            credentials and all transferred bytes in the log.
      *            {@code false} to just include basic events.
      */
     public abstract void startNetLogToFile(String fileName, boolean logAll);
@@ skipping 360 matching lines @@
      */
     @Deprecated
     public interface RequestFinishedListener { // TODO(klm): Add a convenience abstract class.
         /**
          * Invoked with request info.
          * @param requestInfo {@link UrlRequestInfo} for finished request.
          */
         void onRequestFinished(UrlRequestInfo requestInfo);
     }
 }