[Files.app] Remove OK and Cancel buttons in task picker dialog

ui/webui/resources/js/cr/ui/dialogs.js

Index: ui/webui/resources/js/cr/ui/dialogs.js
diff --git a/ui/webui/resources/js/cr/ui/dialogs.js b/ui/webui/resources/js/cr/ui/dialogs.js
index c8c4c97c7494a353e94a4d76adb58b2c63d10f62..5a64fb476754405098207a0b9385228ef2c64a28 100644
--- a/ui/webui/resources/js/cr/ui/dialogs.js
+++ b/ui/webui/resources/js/cr/ui/dialogs.js
@@ -66,22 +66,22 @@ cr.define('cr.ui.dialogs', function() {
     this.text_.className = 'cr-dialog-text';
     this.frame_.appendChild(this.text_);
 
-    var buttons = doc.createElement('div');
-    buttons.className = 'cr-dialog-buttons';
-    this.frame_.appendChild(buttons);
+    this.buttons_ = doc.createElement('div');
+    this.buttons_.className = 'cr-dialog-buttons';
+    this.frame_.appendChild(this.buttons_);
 
     this.okButton_ = doc.createElement('button');
     this.okButton_.className = 'cr-dialog-ok';
     this.okButton_.textContent = BaseDialog.OK_LABEL;
     this.okButton_.addEventListener('click', this.onOkClick_.bind(this));
-    buttons.appendChild(this.okButton_);
+    this.buttons_.appendChild(this.okButton_);
 
     this.cancelButton_ = doc.createElement('button');
     this.cancelButton_.className = 'cr-dialog-cancel';
     this.cancelButton_.textContent = BaseDialog.CANCEL_LABEL;
     this.cancelButton_.addEventListener('click',
                                         this.onCancelClick_.bind(this));
-    buttons.appendChild(this.cancelButton_);
+    this.buttons_.appendChild(this.cancelButton_);
 
     this.initialFocusElement_ = this.okButton_;
   };