Convert //sync from scoped_ptr to std::unique_ptr

sync/internal_api/public/sync_context.h

Index: sync/internal_api/public/sync_context.h
diff --git a/sync/internal_api/public/sync_context.h b/sync/internal_api/public/sync_context.h
index 0d522f91af3c6f1647aa5df252de5b1bf4919450..907ed507d34512b9e0cad284450f22711ab4a016 100644
--- a/sync/internal_api/public/sync_context.h
+++ b/sync/internal_api/public/sync_context.h
@@ -5,7 +5,8 @@
 #ifndef SYNC_INTERNAL_API_PUBLIC_SYNC_CONTEXT_H_
 #define SYNC_INTERNAL_API_PUBLIC_SYNC_CONTEXT_H_
 
-#include "base/memory/scoped_ptr.h"
+#include <memory>
+
 #include "sync/internal_api/public/base/model_type.h"
 
 namespace syncer_v2 {
@@ -29,7 +30,7 @@ class SYNC_EXPORT SyncContext {
   // type's thread.
   virtual void ConnectSyncTypeToWorker(
       syncer::ModelType type,
-      scoped_ptr<ActivationContext> activation_context) = 0;
+      std::unique_ptr<ActivationContext> activation_context) = 0;
 
   // Disconnects the syncer from the model and stops syncing the type.
   //