Split up streams logic to prepare for PlzNavigate RDH changes.

content/browser/streams/stream.h

Index: content/browser/streams/stream.h
diff --git a/content/browser/streams/stream.h b/content/browser/streams/stream.h
index e7e9586ca963c6a4391c43e8ec66433bdfb0a673..90fde39ebe923fa621fa1b2f03724da11dfadb59 100644
--- a/content/browser/streams/stream.h
+++ b/content/browser/streams/stream.h
@@ -78,10 +78,7 @@ class CONTENT_EXPORT Stream : public base::RefCountedThreadSafe<Stream> {
   // and STREAM_COMPLETE if the stream is finalized and all data has been read.
   StreamState ReadRawData(net::IOBuffer* buf, int buf_size, int* bytes_read);
 
-  scoped_ptr<StreamHandle> CreateHandle(
-      const GURL& original_url,
-      const std::string& mime_type,
-      scoped_refptr<net::HttpResponseHeaders> response_headers);
+  scoped_ptr<StreamHandle> CreateHandle();
   void CloseHandle();
 
   // Indicates whether there is space in the buffer to add more data.