Update Stats element to use new directory layout

appengine/swarming/elements/res/imp/stats/partial-line-chart.html

 <!--
 # Copyright 2016 The LUCI Authors. All rights reserved.
 # Use of this source code is governed by the Apache v2.0 license that can be
 # found in the LICENSE file.
 -->
 <!--
   This in an HTML Import-able file that contains the definition
   of the following elements:
 
     <partial-line-chart>
@@ skipping 11 matching lines @@
     names: Array<String>, the names of the data columns to show.  If blank,
         all will be shown.
     title: String, the title of the line graph.
 
   Methods:
     None.
 
   Events:
     None.
 -->
-<link rel="import" href="/imp/bower_components/google-chart/google-chart.html">
+<link rel="import" href="/res/imp/bower_components/google-chart/google-chart.html">
 
 <dom-module id="partial-line-chart">
   <style>
     google-chart {
       width: 100%;
       height: 250px;
     }
   </style>
   <template>
 
@@ skipping 36 matching lines @@
           "title": title,
           "animation": {
             "duration": 500,
             "easing": "out"
           },
           "legend": {"position": "bottom"}
         };
       },
 
       trimData: function() {
-        console.log(this.all_data);
         var table = new google.visualization.DataTable(this.all_data);
         if (!this.names || this.names.length === 0) {
           return JSON.parse(table.toJSON());
         }
 
         var view = new google.visualization.DataView(table);
 
         var colsToShow = [0];
         var cols = this.all_data.cols;
         for (var i = 1;i < cols.length; i++) {
           if (this.names.indexOf(cols[i].id) !== -1) {
             colsToShow.push(i);
           }
         }
 
         view.setColumns(colsToShow);
         return JSON.parse(view.toDataTable().toJSON());
       },
     });
   })();
   </script>
 </dom-module>