Deprecate NonThreadSafe in components/sync in favor of SequenceChecker.

components/sync/device_info/local_device_info_provider_impl.h

Index: components/sync/device_info/local_device_info_provider_impl.h
diff --git a/components/sync/device_info/local_device_info_provider_impl.h b/components/sync/device_info/local_device_info_provider_impl.h
index a786975ce04ca8c84381e6a03ee2cab726162162..f15743f64265ea21eb11b9c508f5bb9f6ed3c8a7 100644
--- a/components/sync/device_info/local_device_info_provider_impl.h
+++ b/components/sync/device_info/local_device_info_provider_impl.h
@@ -10,15 +10,14 @@
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
-#include "base/threading/non_thread_safe.h"
+#include "base/sequence_checker.h"
 #include "components/sync/device_info/device_info.h"
 #include "components/sync/device_info/local_device_info_provider.h"
 #include "components/version_info/version_info.h"
 
 namespace syncer {
 
-class LocalDeviceInfoProviderImpl : public LocalDeviceInfoProvider,
-                                    public base::NonThreadSafe {
+class LocalDeviceInfoProviderImpl : public LocalDeviceInfoProvider {
  public:
   LocalDeviceInfoProviderImpl(version_info::Channel channel,
                               const std::string& version,
@@ -55,6 +54,9 @@ class LocalDeviceInfoProviderImpl : public LocalDeviceInfoProvider,
   std::string cache_guid_;
   std::unique_ptr<DeviceInfo> local_device_info_;
   base::CallbackList<void(void)> callback_list_;
+
+  SEQUENCE_CHECKER(sequence_checker_);
+
   base::WeakPtrFactory<LocalDeviceInfoProviderImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(LocalDeviceInfoProviderImpl);