Split up streams logic to prepare for PlzNavigate RDH changes.

content/public/browser/stream_handle.h

 // Copyright (c) 2013 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 CONTENT_PUBLIC_BROWSER_STREAM_HANDLE_H_
 #define CONTENT_PUBLIC_BROWSER_STREAM_HANDLE_H_
 
-#include "base/callback.h"
-#include "base/memory/ref_counted.h"
+#include "base/callback_forward.h"
 #include "content/common/content_export.h"
 #include "url/gurl.h"
 
-namespace net {
-class HttpResponseHeaders;
-}
-
 namespace content {
 
+// A handle to a Stream. When the handle is destroyed, the stream is released
+// and the URL is invalidated.
 class CONTENT_EXPORT StreamHandle {
  public:
   virtual ~StreamHandle() {}
 
   // Gets the URL the stream can be read from.
   virtual const GURL& GetURL() = 0;
 
-  // Gets the original URL being redirected to this Stream.
-  virtual const GURL& GetOriginalURL() = 0;
-
-  // Get the MIME type associated with this Stream.
-  virtual const std::string& GetMimeType() = 0;
-
-  // Get the HTTP response headers associated with this Stream.
-  virtual scoped_refptr<net::HttpResponseHeaders> GetResponseHeaders() = 0;
-
   // Add a callback which will be called when the Stream is closed.
   virtual void AddCloseListener(const base::Closure& callback) = 0;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_STREAM_HANDLE_H_