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

chrome/browser/resources/chromeos/bluetooth_pair_device.js

 // Copyright (c) 2013 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.
 
 var OptionsPage = options.OptionsPage;
 var BluetoothPairing = options.BluetoothPairing;
 var FakeBluetoothOverlayParent = options.FakeBluetoothOverlayParent;
 
 /** @override */
 OptionsPage.closeOverlay = function() {
-  chrome.send('DialogClose');
+  chrome.send('dialogClose');
 };
 
 /**
  * Listener for the |beforeunload| event.
  */
 window.onbeforeunload = function() {
   OptionsPage.willClose();
 };
 
 /**
@@ skipping 28 matching lines @@
 
   var device = {};
   var args = JSON.parse(chrome.getVariableValue('dialogArguments'));
   device = args;
   device.pairing = 'bluetoothStartConnecting';
   BluetoothPairing.showDialog(device);
   chrome.send('updateBluetoothDevice', [device.address, 'connect']);
 }
 
 document.addEventListener('DOMContentLoaded', load);