Convert //sync from scoped_ptr to std::unique_ptr

sync/internal_api/sync_context_proxy_impl.h

Index: sync/internal_api/sync_context_proxy_impl.h
diff --git a/sync/internal_api/sync_context_proxy_impl.h b/sync/internal_api/sync_context_proxy_impl.h
index bde38e4a5edab2376ce35efd635d96488ed40d87..243cc3894d69bdb25e35f7caee686713626e2eba 100644
--- a/sync/internal_api/sync_context_proxy_impl.h
+++ b/sync/internal_api/sync_context_proxy_impl.h
@@ -5,7 +5,8 @@
 #ifndef SYNC_INTERNAL_API_SYNC_CONTEXT_PROXY_IMPL_H_
 #define SYNC_INTERNAL_API_SYNC_CONTEXT_PROXY_IMPL_H_
 
-#include "base/memory/scoped_ptr.h"
+#include <memory>
+
 #include "base/memory/weak_ptr.h"
 #include "base/sequenced_task_runner.h"
 #include "sync/base/sync_export.h"
@@ -34,12 +35,12 @@ class SYNC_EXPORT SyncContextProxyImpl : public SyncContextProxy {
   // unable to distinguish a slow success from failure.
   void ConnectTypeToSync(
       syncer::ModelType type,
-      scoped_ptr<ActivationContext> activation_context) override;
+      std::unique_ptr<ActivationContext> activation_context) override;
 
   // Disables syncing for the given type on the sync thread.
   void Disconnect(syncer::ModelType type) override;
 
-  scoped_ptr<SyncContextProxy> Clone() const override;
+  std::unique_ptr<SyncContextProxy> Clone() const override;
 
  private:
   // A SequencedTaskRunner representing the thread where the SyncContext lives.