cleanup some build warnings.

frontend/src/query_builder/FieldList.jsx

@@ -85,7 +85,7 @@ export default class FieldList extends Component {
     }
 
     renderItemExtra(item) {
-        let { field, tableMetadata, enableTimeGrouping } = this.props;
+        let { field, enableTimeGrouping } = this.props;
 
         return (
             <div className="flex align-center">

frontend/src/query_builder/FieldName.jsx

@@ -3,8 +3,7 @@ import React, { Component, PropTypes } from "react";
 import Icon from "metabase/components/Icon.jsx";
 
 import Query from "metabase/lib/query";
-import { parseFieldTarget, parseFieldBucketing, formatBucketing } from "metabase/lib/query_time";
-import { isDate } from "metabase/lib/schema_metadata";
+import { parseFieldTarget } from "metabase/lib/query_time";
 
 import { stripId } from "metabase/lib/formatting";
 
@@ -26,9 +25,8 @@ export default class FieldName extends Component {
 
     render() {
         let targetTitle, fkTitle, fkIcon, bucketingTitle;
-        let { field, fieldOptions, tableMetadata } = this.props;
+        let { field, fieldOptions } = this.props;
 
-        let bucketing = parseFieldBucketing(field);
         field = parseFieldTarget(field);
 
         let fieldDef;