[Sync] Renaming client key to client tag.

sync/internal_api/public/shared_model_type_processor.h

Index: sync/internal_api/public/shared_model_type_processor.h
diff --git a/sync/internal_api/public/shared_model_type_processor.h b/sync/internal_api/public/shared_model_type_processor.h
index 6c9382aae32968c075128054d2e93fd36d04f5a5..c6d8b71c32c3c075c679631fab807cffe8784a53 100644
--- a/sync/internal_api/public/shared_model_type_processor.h
+++ b/sync/internal_api/public/shared_model_type_processor.h
@@ -65,10 +65,10 @@ class SYNC_EXPORT SharedModelTypeProcessor : public ModelTypeProcessor,
   bool IsConnected() const;
 
   // ModelTypeChangeProcessor implementation.
-  void Put(const std::string& client_key,
+  void Put(const std::string& client_tag,
            scoped_ptr<EntityData> entity_data,
            MetadataChangeList* metadata_change_list) override;
-  void Delete(const std::string& client_key,
+  void Delete(const std::string& client_tag,
               MetadataChangeList* metadata_change_list) override;
 
   // Returns the list of pending updates.