Hook up ProfileIOData's URLRequestContext to a NetworkService.

chrome/browser/net/profile_network_context_service_factory.cc

+// Copyright 2017 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/profile_network_context_service_factory.h"
+
+#include "chrome/browser/net/profile_network_context_service.h"
+#include "chrome/browser/profiles/profile.h"
+#include "components/keyed_service/content/browser_context_dependency_manager.h"
+
+ProfileNetworkContextService*
+ProfileNetworkContextServiceFactory::GetForContext(
+    content::BrowserContext* browser_context) {
+  return static_cast<ProfileNetworkContextService*>(
+      GetInstance()->GetServiceForBrowserContext(browser_context, true));
+}
+
+ProfileNetworkContextServiceFactory*
+ProfileNetworkContextServiceFactory::GetInstance() {
+  return base::Singleton<ProfileNetworkContextServiceFactory>::get();
+}
+
+ProfileNetworkContextServiceFactory::ProfileNetworkContextServiceFactory()
+    : BrowserContextKeyedServiceFactory(
+          "ProfileNetworkContextService",
+          BrowserContextDependencyManager::GetInstance()) {}
+
+ProfileNetworkContextServiceFactory::~ProfileNetworkContextServiceFactory() {}
+
+KeyedService* ProfileNetworkContextServiceFactory::BuildServiceInstanceFor(
+    content::BrowserContext* profile) const {
+  return new ProfileNetworkContextService(Profile::FromBrowserContext(profile));
+}
+
+content::BrowserContext*
+ProfileNetworkContextServiceFactory::GetBrowserContextToUse(
+    content::BrowserContext* context) const {
+  // Create separate service for incognito profiles.

[Randy Smith (Not in Mondays), 2017/07/19 19:31:10]

Is this a TODO?

[mmenke, 2017/07/19 20:35:38]

No, that's what this line of code does.  The default implementation either
returns the main context given an incognito one or just returns nullptr in the
incognito case (Can't recall which).  This returns the (possibly incognito)
profile passed in to it, indicating that incognito BrowserContexts are lucky
enough to get their own service.

No test currently verifies they're different, but once I add cache configuration
tests and the like, those will give us some coverage, at least.

+  return context;
+}