Fix style download and strip metadata

src/components/App.jsx

@@ -1,5 +1,4 @@
 import React from 'react'
-import { saveAs } from 'file-saver'
 import Mousetrap from 'mousetrap'
 
 import MapboxGlMap from './map/MapboxGlMap'
@@ -90,12 +89,6 @@ export default class App extends React.Component {
     loadDefaultStyle(mapStyle => this.onStyleOpen(mapStyle))
   }
 
-  onStyleDownload() {
-    const mapStyle = this.state.mapStyle
-    const blob = new Blob([formatStyle(mapStyle)], {type: "application/json;charset=utf-8"});
-    saveAs(blob, mapStyle.id + ".json");
-  }
-
   saveStyle(snapshotStyle) {
     this.styleStore.save(snapshotStyle)
   }
@@ -228,7 +221,6 @@ export default class App extends React.Component {
       sources={this.state.sources}
       onStyleChanged={this.onStyleChanged.bind(this)}
       onStyleOpen={this.onStyleChanged.bind(this)}
-      onStyleDownload={this.onStyleDownload.bind(this)}
       onInspectModeToggle={this.changeInspectMode.bind(this)}
     />