net: Move ownership of UploadDataStream from URLRequestHttpJob to URLRequest

net/base/upload_element_reader.h

Index: net/base/upload_element_reader.h
diff --git a/net/base/upload_element_reader.h b/net/base/upload_element_reader.h
index 1511f74dc16c32980fe57f190322a0434072e195..c7178336d473e0991a26f4da7a1845de8ee0eef0 100644
--- a/net/base/upload_element_reader.h
+++ b/net/base/upload_element_reader.h
@@ -12,7 +12,9 @@
 namespace net {
 
 class IOBuffer;
+class UploadBytesElementReader;
 class UploadElement;
+class UploadFileElementReader;
 
 // An interface to read an upload data element.
 class NET_EXPORT UploadElementReader {
@@ -23,6 +25,14 @@ class NET_EXPORT UploadElementReader {
   // Creates an appropriate UploadElementReader instance for the given element.
   static UploadElementReader* Create(const UploadElement& element);
 
+  // Returns this instance's pointer as UploadBytesElementReader when possible,
+  // otherwise returns NULL.
+  virtual const UploadBytesElementReader* AsBytesReader() const;
+
+  // Returns this instance's pointer as UploadFileElementReader when possible,
+  // otherwise returns NULL.
+  virtual const UploadFileElementReader* AsFileReader() const;
+
   // Initializes the instance synchronously when possible, otherwise does
   // initialization aynschronously, returns ERR_IO_PENDING and runs callback.
   // Calling this method again after a Init() success results in resetting the