Enable sync by default on all platforms.

chrome/browser/sync/profile_sync_service.cc

 // Copyright (c) 2006-2008 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/sync/profile_sync_service.h"
 
 #include <stack>
 #include <vector>
 
 #include "app/l10n_util.h"
@@ skipping 407 matching lines @@
 
 void ProfileSyncService::SyncEvent(SyncEventCodes code) {
   static LinearHistogram histogram("Sync.EventCodes", MIN_SYNC_EVENT_CODE,
                                    MAX_SYNC_EVENT_CODE - 1,
                                    MAX_SYNC_EVENT_CODE);
   histogram.SetFlags(kUmaTargetedHistogramFlag);
   histogram.Add(code);
 }
 
 bool ProfileSyncService::IsSyncEnabled() {
-#if defined(OS_POSIX)
-  return CommandLine::ForCurrentProcess()->HasSwitch(switches::kEnableSync);
-#else
+  // We have switches::kEnableSync just in case we need to change back to
+  // sync-disabled-by-default on a platform.
   return !CommandLine::ForCurrentProcess()->HasSwitch(switches::kDisableSync);
-#endif
 }
 
 bool ProfileSyncService::ShouldPushChanges() {
   // True only after all bootstrapping has succeeded: the bookmark model is
   // loaded, the sync backend is initialized, the two domains are
   // consistent with one another, and no unrecoverable error has transpired.
   return change_processor_->IsRunning();
 }