Remove unused variable

js/id/core/graph.js

@@ -6,7 +6,6 @@ iD.Graph = function(other, mutable) {
         this.entities = _.assign(Object.create(base.entities), other.entities);
         this._parentWays = _.assign(Object.create(base.parentWays), other._parentWays);
         this._parentRels = _.assign(Object.create(base.parentRels), other._parentRels);
-        this.inherited = true;
 
     } else {
         this.entities = Object.create({});

js/id/core/history.js

@@ -257,7 +257,6 @@ iD.History = function(context) {
                 });
             }
 
-            stack[0].graph.inherited = false;
             dispatch.change();
 
             return history;