arc: Prepare ArcAuthEndpoint flag for finch experiment.

chrome/browser/chromeos/arc/arc_auth_code_fetcher.cc

 // Copyright 2016 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/chromeos/arc/arc_auth_code_fetcher.h"
 
 #include "base/json/json_string_value_serializer.h"
 #include "base/json/json_writer.h"
 #include "base/values.h"
 #include "chrome/browser/chromeos/arc/arc_auth_code_fetcher_delegate.h"
@@ skipping 20 matching lines @@
 
 constexpr char kConsumerName[] = "ArcAuthContext";
 constexpr char kToken[] = "token";
 constexpr char kDeviceId[] = "device_id";
 constexpr char kDeviceType[] = "device_type";
 constexpr char kDeviceTypeArc[] = "arc_plus_plus";
 constexpr char kLoginScopedToken[] = "login_scoped_token";
 constexpr char kGetAuthCodeHeaders[] =
     "Content-Type: application/json; charset=utf-8";
 constexpr char kContentTypeJSON[] = "application/json";
+constexpr char kEndPoint[] =
+    "https://www.googleapis.com/oauth2/v4/ExchangeToken";
 
 }  // namespace
 
 ArcAuthCodeFetcher::ArcAuthCodeFetcher(
     ArcAuthCodeFetcherDelegate* delegate,
     net::URLRequestContextGetter* request_context_getter,
-    Profile* profile,
-    const std::string& auth_endpoint)
+    Profile* profile)
     : OAuth2TokenService::Consumer(kConsumerName),
       delegate_(delegate),
       request_context_getter_(request_context_getter),
-      profile_(profile),
-      auth_endpoint_(auth_endpoint) {
+      profile_(profile) {
   // Get token service and account ID to fetch auth tokens.
   ProfileOAuth2TokenService* const token_service =
       ProfileOAuth2TokenServiceFactory::GetForProfile(profile_);
   const SigninManagerBase* const signin_manager =
       SigninManagerFactory::GetForProfile(profile_);
   CHECK(token_service && signin_manager);
   const std::string& account_id = signin_manager->GetAuthenticatedAccountId();
   DCHECK(!account_id.empty());
   DCHECK(token_service->RefreshTokenIsAvailable(account_id));
 
@@ skipping 15 matching lines @@
       multi_user_util::GetAccountIdFromProfile(profile_));
   DCHECK(!device_id.empty());
 
   base::DictionaryValue request_data;
   request_data.SetString(kLoginScopedToken, access_token);
   request_data.SetString(kDeviceType, kDeviceTypeArc);
   request_data.SetString(kDeviceId, device_id);
   std::string request_string;
   base::JSONWriter::Write(request_data, &request_string);
 
-  DCHECK(!auth_endpoint_.empty());
-  auth_code_fetcher_ = net::URLFetcher::Create(0, GURL(auth_endpoint_),
-                                               net::URLFetcher::POST, this);
+  auth_code_fetcher_ =
+      net::URLFetcher::Create(0, GURL(kEndPoint), net::URLFetcher::POST, this);
   auth_code_fetcher_->SetRequestContext(request_context_getter_);
   auth_code_fetcher_->SetUploadData(kContentTypeJSON, request_string);
   auth_code_fetcher_->SetLoadFlags(net::LOAD_DISABLE_CACHE |
                                    net::LOAD_BYPASS_CACHE);
   auth_code_fetcher_->SetAutomaticallyRetryOnNetworkChanges(
       kGetAuthCodeNetworkRetry);
   auth_code_fetcher_->SetExtraRequestHeaders(kGetAuthCodeHeaders);
   auth_code_fetcher_->Start();
 }
 
@@ skipping 48 matching lines @@
 
   delegate_->OnAuthCodeSuccess(auth_code);
 }
 
 void ArcAuthCodeFetcher::ResetFetchers() {
   login_token_request_.reset();
   auth_code_fetcher_.reset();
 }
 
 }  // namespace arc