[gnome-maps/wip/mlundblad/shape-layer-fixes: 8/9] gpxShapeLayer: Use util function to get string from buffer

[Marcus Lundblad <mlundblad src gnome org>]

commit 915e2c4977de5f3a453b0c91650316e0a0bf2e41
Author: Marcus Lundblad <ml update uu se>
Date:   Fri Feb 15 22:48:15 2019 +0100

    gpxShapeLayer: Use util function to get string from buffer

 src/gpxShapeLayer.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/src/gpxShapeLayer.js b/src/gpxShapeLayer.js
index 6154b82..e3a23b9 100644
--- a/src/gpxShapeLayer.js
+++ b/src/gpxShapeLayer.js
@@ -21,6 +21,7 @@ const GObject = imports.gi.GObject;
 
 const GeoJSONSource = imports.geoJSONSource;
 const ShapeLayer = imports.shapeLayer;
+const Utils = imports.utils;
 const Togeojson = imports.togeojson.togeojson;
 const Domparser = imports.xmldom.domparser;
 
@@ -37,7 +38,7 @@ class GpxShapeLayer extends ShapeLayer.ShapeLayer {
     }
 
     _parseContent() {
-        let s = this._fileContents.toString();
+        let s = Utils.getBufferText(this._fileContents);
         let parser = new Domparser.DOMParser();
         let json = Togeojson.toGeoJSON.gpx(parser.parseFromString(s));
         this._mapSource.parse(json);