[Cronet] Change interface APIs to abstract classes

components/cronet/android/java/src/org/chromium/net/UrlRequestContext.java

 // Copyright 2014 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.util.Log;
 
 import java.lang.reflect.Constructor;
@@ skipping 11 matching lines @@
     /**
      * Creates a {@link UrlRequest} object. All callbacks will
      * be called on {@code executor}'s thread. {@code executor} must not run
      * tasks on the current thread to prevent blocking networking operations
      * and causing exceptions during shutdown. Request is given medium priority,
      * see {@link UrlRequest#REQUEST_PRIORITY_MEDIUM}. To specify other
      * priorities see {@link #createRequest(String, UrlRequestListener,
      * Executor, int priority)}.
      *
      * @param url {@link java.net.URL} for the request.
-     * @param listener callback interface that gets called on different events.
+     * @param listener callback class that gets called on different events.
      * @param executor {@link Executor} on which all callbacks will be called.
      * @return new request.
      */
     public abstract UrlRequest createRequest(String url,
             UrlRequestListener listener, Executor executor);
 
     /**
      * Creates a {@link UrlRequest} object. All callbacks will
      * be called on {@code executor}'s thread. {@code executor} must not run
      * tasks on the current thread to prevent blocking networking operations
      * and causing exceptions during shutdown.
      *
      * @param url {@link java.net.URL} for the request.
-     * @param listener callback interface that gets called on different events.
+     * @param listener callback class that gets called on different events.
      * @param executor {@link Executor} on which all callbacks will be called.
      * @param priority priority of the request which should be one of the
      *         {@link UrlRequest#REQUEST_PRIORITY_IDLE REQUEST_PRIORITY_*}
      *         values.
      * @return new request.
      */
     public abstract UrlRequest createRequest(String url,
             UrlRequestListener listener, Executor executor, int priority);
 
     /**
@@ skipping 80 matching lines @@
         } catch (ClassNotFoundException e) {
             // Leave as null.
         } catch (Exception e) {
             throw new IllegalStateException(
                     "Cannot instantiate: " + CRONET_URL_REQUEST_CONTEXT,
                     e);
         }
         return urlRequestContext;
     }
 }