Revert 187230

content/browser/streams/stream_context.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_context.h"
-
-#include "base/bind.h"
-#include "content/browser/streams/stream_registry.h"
-#include "content/public/browser/browser_context.h"
-
-using base::UserDataAdapter;
-
-namespace {
-const char* kStreamContextKeyName = "content_stream_context";
-}
-
-namespace content {
-
-StreamContext::StreamContext() {}
-
-StreamContext* StreamContext::GetFor(BrowserContext* context) {
-  if (!context->GetUserData(kStreamContextKeyName)) {
-    scoped_refptr<StreamContext> stream = new StreamContext();
-    context->SetUserData(kStreamContextKeyName,
-                         new UserDataAdapter<StreamContext>(stream));
-    // Check first to avoid memory leak in unittests.
-    if (BrowserThread::IsMessageLoopValid(BrowserThread::IO)) {
-      BrowserThread::PostTask(
-          BrowserThread::IO, FROM_HERE,
-          base::Bind(&StreamContext::InitializeOnIOThread, stream));
-    }
-  }
-
-  return UserDataAdapter<StreamContext>::Get(context, kStreamContextKeyName);
-}
-
-void StreamContext::InitializeOnIOThread() {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
-  registry_.reset(new StreamRegistry());
-}
-
-StreamContext::~StreamContext() {}
-
-}  // namespace content