win/aura: Remove some more non-aura code for Windows.

chrome/browser/ui/webui/help/version_updater_win.cc

 // 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 "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/strings/string16.h"
 #include "base/version.h"
 #include "base/win/win_util.h"
@@ skipping 233 matching lines @@
   return TRUE;
 }
 
 gfx::AcceleratedWidget VersionUpdaterWin::GetElevationParent() {
   // Look for a visible window belonging to the UI thread.
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   HWND window = NULL;
   EnumThreadWindows(GetCurrentThreadId(),
                     WindowEnumeration,
                     reinterpret_cast<LPARAM>(&window));
-#if !defined(USE_AURA)
-  // If using Aura, we might not have a Visible window in this process. In
-  // theory Google update can cope with that.
-  DCHECK(window != NULL) << "Failed to find a valid window handle on thread: "
-                         << GetCurrentThreadId();
-#endif
   return window;
 }
 
 void VersionUpdaterWin::BeginUpdateCheckOnFileThread(bool install_if_newer) {
   scoped_refptr<base::TaskRunner> task_runner(
       content::BrowserThread::GetMessageLoopProxyForThread(
           content::BrowserThread::FILE));
   BeginUpdateCheck(task_runner, install_if_newer, GetElevationParent(),
                    base::Bind(&VersionUpdaterWin::OnUpdateCheckResults,
                               weak_factory_.GetWeakPtr()));
 }
 
 }  // namespace
 
 VersionUpdater* VersionUpdater::Create(content::BrowserContext* /* context */) {
   return new VersionUpdaterWin;
 }