Use GN buildflags and features to configure account consistency

components/signin/core/common/profile_management_switches.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 "components/signin/core/common/profile_management_switches.h"
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/feature_list.h"
 #include "base/metrics/field_trial.h"
+#include "build/build_config.h"
 #include "components/signin/core/common/signin_switches.h"
 
 namespace switches {
 
 AccountConsistencyMethod GetAccountConsistencyMethod() {
-#if defined(OS_ANDROID) || defined(OS_IOS)
+#if BUILDFLAG(ENABLE_MIRROR)
   // Mirror is enabled on Android and iOS.
   return AccountConsistencyMethod::kMirror;
 #else
   base::CommandLine* cmd = base::CommandLine::ForCurrentProcess();
   std::string method = cmd->GetSwitchValueASCII(switches::kAccountConsistency);
   if (method == switches::kAccountConsistencyMirror)
     return AccountConsistencyMethod::kMirror;
+
+#if BUILDFLAG(ENABLE_DICE_SUPPORT)
   if (method == switches::kAccountConsistencyDice)
     return AccountConsistencyMethod::kDice;
+#endif
+
   return AccountConsistencyMethod::kDisabled;
-#endif  // defined(OS_ANDROID) || defined(OS_IOS)
+#endif  // BUILDFLAG(ENABLE_MIRROR)
 }
 
 bool IsAccountConsistencyMirrorEnabled() {
   return GetAccountConsistencyMethod() == AccountConsistencyMethod::kMirror;
 }
 
 bool IsAccountConsistencyDiceEnabled() {
   return GetAccountConsistencyMethod() == AccountConsistencyMethod::kDice;
 }
 
 bool IsExtensionsMultiAccount() {
 #if defined(OS_ANDROID) || defined(OS_IOS)
   NOTREACHED() << "Extensions are not enabled on Android or iOS";
   // Account consistency is enabled on Android and iOS.
   return false;
 #endif
 
   return base::CommandLine::ForCurrentProcess()->HasSwitch(
              switches::kExtensionsMultiAccount) ||
          GetAccountConsistencyMethod() == AccountConsistencyMethod::kMirror;
 }
 
 void EnableAccountConsistencyMirrorForTesting(base::CommandLine* command_line) {
-#if !defined(OS_ANDROID) && !defined(OS_IOS)
+#if !BUILDFLAG(ENABLE_MIRROR)
   command_line->AppendSwitchASCII(switches::kAccountConsistency,
                                   switches::kAccountConsistencyMirror);
 #endif
 }
 
-#if !defined(OS_ANDROID) && !defined(OS_IOS)
+#if BUILDFLAG(ENABLE_DICE_SUPPORT)
 void EnableAccountConsistencyDiceForTesting(base::CommandLine* command_line) {
   command_line->AppendSwitchASCII(switches::kAccountConsistency,
                                   switches::kAccountConsistencyDice);
 }
 #endif
 
 }  // namespace switches