MD Settings: Fixing positioning of reset profile dialog.

Removing extraneous call to center(), which after latest Polymer roll (rev 374191)
started messing up the dialog position.

BUG=586599

Review URL: https://codereview.chromium.org/1705603002

Cr-Commit-Position: refs/heads/master@{#376022}

chrome/browser/resources/settings/reset_page/reset_profile_dialog.js

@@ -28,9 +28,6 @@ Polymer({
 
         setFeedbackInfo: function(data) {
           this.set('feedbackInfo_', data.feedbackInfo);
-          this.async(function() {
-            this.$.dialog.center();
-          });
         }.bind(this),
       };
     }.bind(this));