Clean up some ifdefs around Win Aura.

chrome/browser/plugins/plugin_observer.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 "chrome/browser/plugins/plugin_observer.h"
 
 #include "base/auto_reset.h"
 #include "base/bind.h"
 #include "base/debug/crash_logging.h"
 #include "base/metrics/histogram.h"
@@ skipping 167 matching lines @@
 }
 
 PluginObserver::~PluginObserver() {
 #if defined(ENABLE_PLUGIN_INSTALLATION)
   STLDeleteValues(&plugin_placeholders_);
 #endif
 }
 
 void PluginObserver::RenderFrameCreated(
     content::RenderFrameHost* render_frame_host) {
-#if defined(USE_AURA) && defined(OS_WIN)
+#if defined(OS_WIN)
   // If the window belongs to the Ash desktop, before we navigate we need
   // to tell the renderview that NPAPI plugins are not supported so it does
   // not try to instantiate them. The final decision is actually done in
   // the IO thread by PluginInfoMessageFilter of this proces,s but it's more
   // complex to manage a map of Ash views in PluginInfoMessageFilter than
   // just telling the renderer via IPC.
 
   // TODO(shrikant): Implement solution which will help associate
   // render_view_host/webcontents/view/window instance with host desktop.
   // Refer to issue http://crbug.com/317940.
@@ skipping 212 matching lines @@
   scoped_ptr<PluginMetadata> plugin;
   bool ret = PluginFinder::GetInstance()->FindPluginWithIdentifier(
       identifier, NULL, &plugin);
   DCHECK(ret);
 
   PluginMetroModeInfoBarDelegate::Create(
       InfoBarService::FromWebContents(web_contents()),
       PluginMetroModeInfoBarDelegate::DESKTOP_MODE_REQUIRED, plugin->name());
 #endif
 }