Replace c/b/nss_context by a KeyedService.

chrome/browser/net/nss_context.cc

-// Copyright 2014 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 "chrome/browser/net/nss_context.h"
-
-#include "base/message_loop/message_loop_proxy.h"
-#include "chrome/browser/profiles/profile.h"
-#include "content/public/browser/browser_thread.h"
-#include "content/public/browser/resource_context.h"
-
-using content::BrowserThread;
-
-namespace {
-
-// Relays callback to the right message loop.
-void DidGetCertDBOnIOThread(
-    scoped_refptr<base::MessageLoopProxy> response_message_loop,
-    const base::Callback<void(net::NSSCertDatabase*)>& callback,
-    net::NSSCertDatabase* cert_db) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
-
-  response_message_loop->PostTask(FROM_HERE, base::Bind(callback, cert_db));
-}
-
-// Gets NSSCertDatabase for the resource context.
-void GetCertDBOnIOThread(
-    content::ResourceContext* context,
-    scoped_refptr<base::MessageLoopProxy> response_message_loop,
-    const base::Callback<void(net::NSSCertDatabase*)>& callback) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
-
-  // Note that the callback will be used only if the cert database hasn't yet
-  // been initialized.
-  net::NSSCertDatabase* cert_db = GetNSSCertDatabaseForResourceContext(
-      context,
-      base::Bind(&DidGetCertDBOnIOThread, response_message_loop, callback));
-
-  if (cert_db)
-    DidGetCertDBOnIOThread(response_message_loop, callback, cert_db);
-}
-
-}  // namespace
-
-void GetNSSCertDatabaseForProfile(
-    Profile* profile,
-    const base::Callback<void(net::NSSCertDatabase*)>& callback) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
-
-  BrowserThread::PostTask(BrowserThread::IO,
-                          FROM_HERE,
-                          base::Bind(&GetCertDBOnIOThread,
-                                     profile->GetResourceContext(),
-                                     base::MessageLoopProxy::current(),
-                                     callback));
-}
-