Revert 138168 - net: Fix a regression that broke file uploading with http authentication

net/base/upload_data.h

Index: net/base/upload_data.h
===================================================================
--- net/base/upload_data.h	(revision 138174)
+++ net/base/upload_data.h	(working copy)
@@ -129,9 +129,8 @@
     // Returns the number of bytes remaining to read.
     uint64 BytesRemaining();
 
-    // Resets the offset to zero and closes the file stream if opened, so
-    // that the element can be reread.
-    void ResetOffset();
+    // Resets the offset to zero, so that the element can be reread.
+    void ResetOffset() { offset_ = 0; }
 
    private:
     // Returns a FileStream opened for reading for this element, positioned