Revert 187230

content/browser/streams/stream_registry.cc

-// 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.
-
-#include "content/browser/streams/stream_registry.h"
-
-#include "content/browser/streams/stream.h"
-
-namespace content {
-
-StreamRegistry::StreamRegistry() {
-}
-
-StreamRegistry::~StreamRegistry() {
-}
-
-void StreamRegistry::RegisterStream(scoped_refptr<Stream> stream) {
-  DCHECK(CalledOnValidThread());
-  DCHECK(stream);
-  DCHECK(!stream->url().is_empty());
-  streams_[stream->url()] = stream;
-}
-
-scoped_refptr<Stream> StreamRegistry::GetStream(const GURL& url) {
-  DCHECK(CalledOnValidThread());
-  StreamMap::const_iterator stream = streams_.find(url);
-  if (stream != streams_.end())
-    return stream->second;
-
-  return NULL;
-}
-
-bool StreamRegistry::CloneStream(const GURL& url, const GURL& src_url) {
-  DCHECK(CalledOnValidThread());
-  scoped_refptr<Stream> stream(GetStream(src_url));
-  if (stream) {
-    streams_[url] = stream;
-    return true;
-  }
-  return false;
-}
-
-void StreamRegistry::UnregisterStream(const GURL& url) {
-  DCHECK(CalledOnValidThread());
-  streams_.erase(url);
-}
-
-}  // namespace content