Fix compilation error due to removal of implicit scoped_refptr to ptr conversion.

components/cronet/android/wrapped_channel_upload_element_reader.cc

Index: components/cronet/android/wrapped_channel_upload_element_reader.cc
diff --git a/components/cronet/android/wrapped_channel_upload_element_reader.cc b/components/cronet/android/wrapped_channel_upload_element_reader.cc
index 3027cbadab14600f46a5750c52bee900348b3e91..a4b0d0d3e70ed299a4898459c88e057b21b87f5c 100644
--- a/components/cronet/android/wrapped_channel_upload_element_reader.cc
+++ b/components/cronet/android/wrapped_channel_upload_element_reader.cc
@@ -41,7 +41,7 @@ int WrappedChannelElementReader::Read(net::IOBuffer* buf,
                                       int buf_length,
                                       const net::CompletionCallback& callback) {
   DCHECK(!callback.is_null());
-  DCHECK(delegate_);
+  DCHECK(delegate_.get());
   // TODO(mef): Post the read to file thread.
   int bytes_read = delegate_->ReadFromUploadChannel(buf, buf_length);
   if (bytes_read < 0)