Remove explicit JNI references by adding UrlRequest.readFromUploadChannel callback.

components/cronet/android/wrapped_channel_upload_element_reader.h

 // 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.
 
 #ifndef COMPONENTS_CRONET_ANDROID_WRAPPED_CHANNEL_UPLOAD_ELEMENT_READER_H_
 #define COMPONENTS_CRONET_ANDROID_WRAPPED_CHANNEL_UPLOAD_ELEMENT_READER_H_
 
-#include <jni.h>
-
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
+#include "components/cronet/android/url_request_peer.h"
 #include "net/base/completion_callback.h"
 #include "net/base/upload_element_reader.h"
 
 namespace net {
 class IOBuffer;
 }  // namespace net
 
 namespace cronet {
 
-bool WrappedChannelRegisterJni(JNIEnv* env);
-
 // An UploadElementReader implementation for
 // java.nio.channels.ReadableByteChannel.
 // |channel_| should outlive this class because this class does not take the
 // ownership of the data.
 class WrappedChannelElementReader : public net::UploadElementReader {
  public:
-  WrappedChannelElementReader(JNIEnv* env, jobject channel, uint64 length);
+  WrappedChannelElementReader(
+      scoped_refptr<URLRequestPeer::URLRequestPeerDelegate> delegate,
+      uint64 length);
   virtual ~WrappedChannelElementReader();
 
   // UploadElementReader overrides:
   virtual int Init(const net::CompletionCallback& callback) OVERRIDE;
   virtual uint64 GetContentLength() const OVERRIDE;
   virtual uint64 BytesRemaining() const OVERRIDE;
   virtual bool IsInMemory() const OVERRIDE;
   virtual int Read(net::IOBuffer* buf,
                    int buf_length,
                    const net::CompletionCallback& callback) OVERRIDE;
 
  private:
   const uint64 length_;
   uint64 offset_;
-  jobject channel_;
+  scoped_refptr<URLRequestPeer::URLRequestPeerDelegate> delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(WrappedChannelElementReader);
 };
 
 }  // namespace cronet
 
 #endif  // COMPONENTS_CRONET_ANDROID_WRAPPED_CHANNEL_UPLOAD_ELEMENT_READER_H_