Rewire the local sync switches through the pref store.

components/browser_sync/profile_sync_service.cc

 // Copyright (c) 2012 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/browser_sync/profile_sync_service.h"
 
 #include <stddef.h>
 
 #include <cstddef>
 #include <map>
@@ skipping 489 matching lines @@
     options.timer_slack = base::TIMER_SLACK_MAXIMUM;
     CHECK(sync_thread_->StartWithOptions(options));
   }
 
   SyncCredentials credentials = GetCredentials();
 
   if (delete_stale_data)
     ClearStaleErrors();
 
   bool enable_local_sync_backend = false;
-  base::FilePath local_sync_backend_folder;
+  base::FilePath local_sync_backend_folder =
+      sync_prefs_.GetLocalSyncBackendDir();
 #if defined(OS_WIN)
-  enable_local_sync_backend = base::CommandLine::ForCurrentProcess()->HasSwitch(
-      switches::kEnableLocalSyncBackend);
-  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
-          switches::kLocalSyncBackendDir)) {
-    local_sync_backend_folder =
-        base::CommandLine::ForCurrentProcess()->GetSwitchValuePath(
-            switches::kLocalSyncBackendDir);
-  } else {
+  enable_local_sync_backend = sync_prefs_.IsLocalSyncEnabled();
+  if (local_sync_backend_folder.empty()) {
     // TODO(pastarmovj): Add DIR_ROAMING_USER_DATA to PathService to simplify
     // this code and move the logic in its right place. See crbug/657810.
     CHECK(
         base::PathService::Get(base::DIR_APP_DATA, &local_sync_backend_folder));
     local_sync_backend_folder =
         local_sync_backend_folder.Append(FILE_PATH_LITERAL("Chrome/User Data"));
   }
   // This code as it is now will assume the same profile order is present on all
   // machines, which is not a given. It is to be defined if only the Default
   // profile should get this treatment or all profile as is the case now. The
@@ skipping 2004 matching lines @@
 
   DCHECK(startup_controller_->IsSetupInProgress());
   startup_controller_->SetSetupInProgress(false);
 
   if (IsBackendInitialized())
     ReconfigureDatatypeManager();
   NotifyObservers();
 }
 
 }  // namespace browser_sync