Remove explicit JNI references by adding UrlRequest.readFromUploadChannel callback.

components/cronet/android/url_request_peer.cc

 // 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.
 
 #include "url_request_peer.h"
 
 #include "base/strings/string_number_conversions.h"
 #include "components/cronet/android/url_request_context_peer.h"
 #include "components/cronet/android/wrapped_channel_upload_element_reader.h"
 #include "net/base/load_flags.h"
@@ skipping 33 matching lines @@
 }
 
 void URLRequestPeer::SetUploadContent(const char* bytes, int bytes_len) {
   std::vector<char> data(bytes, bytes + bytes_len);
   scoped_ptr<net::UploadElementReader> reader(
       new net::UploadOwnedBytesElementReader(&data));
   upload_data_stream_.reset(net::UploadDataStream::CreateWithReader(
       reader.Pass(), 0));
 }
 
-void URLRequestPeer::SetUploadChannel(
-    JNIEnv* env, jobject channel, int64 content_length) {
+void URLRequestPeer::SetUploadChannel(JNIEnv* env, int64 content_length) {
   scoped_ptr<net::UploadElementReader> reader(
-      new WrappedChannelElementReader(env, channel, content_length));
+      new WrappedChannelElementReader(delegate_, content_length));
   upload_data_stream_.reset(net::UploadDataStream::CreateWithReader(
       reader.Pass(), 0));
 }
 
 std::string URLRequestPeer::GetHeader(const std::string &name) const {
   std::string value;
   if (url_request_ != NULL) {
     url_request_->GetResponseHeaderByName(name, &value);
   }
   return value;
@@ skipping 182 matching lines @@
 
   delegate_->OnBytesRead(this);
   delegate_->OnRequestFinished(this);
 }
 
 unsigned char* URLRequestPeer::Data() const {
   return reinterpret_cast<unsigned char*>(read_buffer_->StartOfBuffer());
 }
 
 }  // namespace cronet