[Proximity Auth] Create one ProximityAuthClient per profile, rather than one global one.

chrome/browser/signin/chrome_proximity_auth_client_factory.cc

+// Copyright 2015 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/signin/chrome_proximity_auth_client_factory.h"
+
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/signin/chrome_proximity_auth_client.h"
+#include "components/keyed_service/content/browser_context_dependency_manager.h"
+
+// static
+ChromeProximityAuthClientFactory*
+ChromeProximityAuthClientFactory::GetInstance() {
+  return Singleton<ChromeProximityAuthClientFactory>::get();
+}
+
+// static
+ChromeProximityAuthClient* ChromeProximityAuthClientFactory::GetForProfile(
+    Profile* profile) {
+  return static_cast<ChromeProximityAuthClient*>(
+      GetInstance()->GetServiceForBrowserContext(profile, true));
+}
+
+ChromeProximityAuthClientFactory::ChromeProximityAuthClientFactory()
+    : BrowserContextKeyedServiceFactory(
+          "ChromeProximityAuthClient",
+          BrowserContextDependencyManager::GetInstance()) {
+}

[Mike Lerman, 2015/06/26 13:09:51]

DependsOn(SigninManagerFactory)? 

[Ilya Sherman, 2015/06/27 08:18:00]

Acknowledged.  I think it actually wouldn't have been necessary, since there's
no lifetime dependency between the two classes... but this file is gone now.

+
+ChromeProximityAuthClientFactory::~ChromeProximityAuthClientFactory() {
+}
+
+KeyedService* ChromeProximityAuthClientFactory::BuildServiceInstanceFor(
+    content::BrowserContext* context) const {
+  return new ChromeProximityAuthClient(Profile::FromBrowserContext(context));
+}