Switch on-demand update checks to the less-old GoogleUpdate3 API.

chrome/browser/ui/webui/help/version_updater_mac.mm

 // 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.
 
 #include "chrome/browser/ui/webui/help/version_updater_mac.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "chrome/browser/lifetime/application_lifetime.h"
 #import "chrome/browser/mac/keystone_glue.h"
@@ skipping 35 matching lines @@
   [[NSNotificationCenter defaultCenter] removeObserver:self];
   [super dealloc];
 }
 
 - (void)handleStatusNotification:(NSNotification*)notification {
   versionUpdater_->UpdateStatus([notification userInfo]);
 }
 
 @end  // @implementation KeystoneObserver
 
-VersionUpdater* VersionUpdater::Create(content::BrowserContext* /* context */) {
+VersionUpdater* VersionUpdater::Create(
+    content::WebContents* /* web_contents */) {

[Peter Kasting, 2015/05/12 22:04:34]

Nit: Same comment

   return new VersionUpdaterMac;
 }
 
 VersionUpdaterMac::VersionUpdaterMac()
     : show_promote_button_(false),
       keystone_observer_([[KeystoneObserver alloc] initWithUpdater:this]) {
 }
 
 VersionUpdaterMac::~VersionUpdaterMac() {
 }
@@ skipping 173 matching lines @@
   } else if (recent_status == kAutoupdatePromoting ||
              recent_status == kAutoupdatePromoteFailed) {
     // Show promotion UI because the user either just clicked that button or
     // because the user should be able to click it again.
     show_promote_button_ = true;
   } else {
     // Show the promote button if promotion is a possibility.
     show_promote_button_ = [keystone_glue wantsPromotion];
   }
 }