CrOS files app: Stop using <paper-dialog>, use plain <dialog> instead.

ui/file_manager/file_manager/foreground/elements/files_quick_view.js

Index: ui/file_manager/file_manager/foreground/elements/files_quick_view.js
diff --git a/ui/file_manager/file_manager/foreground/elements/files_quick_view.js b/ui/file_manager/file_manager/foreground/elements/files_quick_view.js
index a3096bbfcce60fb70e11b4df662bb22187c599df..d7099154fb3d8aa7502ed2daa5a600dc32cd7d70 100644
--- a/ui/file_manager/file_manager/foreground/elements/files_quick_view.js
+++ b/ui/file_manager/file_manager/foreground/elements/files_quick_view.js
@@ -51,10 +51,15 @@ var FilesQuickView = Polymer({
     this.browsable = false;
   },
 
+  /** @return {boolean} */
+  isOpened: function() {
+    return this.$.dialog.open;
+  },
+
   // Opens the dialog.
   open: function() {
     if (!this.isOpened())
-      this.$.dialog.open();
+      this.$.dialog.showModal();
   },
 
   // Closes the dialog.
@@ -63,15 +68,6 @@ var FilesQuickView = Polymer({
       this.$.dialog.close();
   },
 
-  /**
-   * @return {boolean}
-   */
-  isOpened: function() {
-    // TODO(oka): This is a workaround to satisfy closure compiler.
-    // Update ['opened'] to .opened.
-    return (/** @type{Object} */ (this.$.dialog))['opened'];
-  },
-
   /**
    * @return {!FilesMetadataBox}
    */