Cronet API Refactoring

components/cronet/README.md

 # Quick Start Guide to Using Cronet
 Cronet is the networking stack of Chromium put into a library for use on
 mobile. This is the same networking stack that is used in the Chrome browser
 by over a billion people. It offers an easy-to-use, high performance,
 standards-compliant, and secure way to perform HTTP requests. Cronet has support
 for both Android and iOS. On Android, Cronet offers its own Java asynchronous
 API as well as support for the [java.net.HttpURLConnection] API.
 This document gives a brief introduction to using these two Java APIs.
 
 ### Basics
@@ skipping 54 matching lines @@
              // not resolved, connection to server refused, etc.
         }
     }
 
 Make a request like this:
 
     CronetEngine.Builder engineBuilder = new CronetEngine.Builder(getContext());
     CronetEngine engine = engineBuilder.build();
     Executor executor = Executors.newSingleThreadExecutor();
     MyCallback callback = new MyCallback();
-    UrlRequest.Builder requestBuilder = new UrlRequest.Builder(
-            "https://www.example.com", callback, executor, engine);
+    UrlRequest.Builder requestBuilder = engine.newUrlRequestBuilder(
+            "https://www.example.com", callback, executor);
     UrlRequest request = requestBuilder.build();
     request.start();
 
 In the above example, `MyCallback` extends `UrlRequest.Callback`. The request
 is started asynchronously. When the response is ready (fully or partially), and
 in the event of failures or redirects, `callback`'s methods will be invoked on
 `executor`'s thread to inform the client of the request state and/or response
 information.
 
 ### Downloading Data
@@ skipping 73 matching lines @@
 see {@link org.chromium.net.CronetEngine#createURLStreamHandlerFactory} for
 more information).
 You can configure Cronet and control caching through the
 `CronetEngine.Builder` instance, `engineBuilder`
 (See [Configuring Cronet](#configuring-cronet) section), before you build the
 `CronetEngine` and then call `CronetEngine.createURLStreamHandlerFactory()`.
 
 [ByteBuffer]: https://developer.android.com/reference/java/nio/ByteBuffer.html
 [chrome://net-internals#import]: chrome://net-internals#import
 [java.net.HttpURLConnection]: https://developer.android.com/reference/java/net/HttpURLConnection.html