webui: rename "DialogClose" to "dialogClose" to match other webui messages.

chrome/browser/resources/print_preview/native_layer.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 cr.define('print_preview', function() {
   'use strict';
 
   /**
    * An interface to the native Chromium printing system layer.
    * @constructor
@@ skipping 321 matching lines @@
     /** Shows Google Cloud Print's web-based print dialog.
      * @param {number} pageCount Number of pages to print.
      */
     startShowCloudPrintDialog: function(pageCount) {
       chrome.send('printWithCloudPrintDialog', [pageCount]);
     },
 
     /** Closes the print preview dialog. */
     startCloseDialog: function() {
       chrome.send('closePrintPreviewDialog');
-      chrome.send('DialogClose');
+      chrome.send('dialogClose');
     },
 
     /** Hide the print preview dialog and allow the native layer to close it. */
     startHideDialog: function() {
       chrome.send('hidePreview');
     },
 
     /**
      * Opens the Google Cloud Print sign-in tab. The DESTINATIONS_RELOAD event
      *     will be dispatched in response.
@@ skipping 496 matching lines @@
       return this.serializedAppStateStr_;
     }
   };
 
   // Export
   return {
     NativeInitialSettings: NativeInitialSettings,
     NativeLayer: NativeLayer
   };
 });