Don't build a bunch of stuff on Aura, rather than ifdefing out code in it.

chrome/browser/chrome_plugin_message_filter.cc

Index: chrome/browser/chrome_plugin_message_filter.cc
===================================================================
--- chrome/browser/chrome_plugin_message_filter.cc	(revision 110386)
+++ chrome/browser/chrome_plugin_message_filter.cc	(working copy)
@@ -7,7 +7,6 @@
 #include "base/bind.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/infobars/infobar_tab_helper.h"
-#include "chrome/browser/plugin_download_helper.h"
 #include "chrome/browser/plugin_installer_infobar_delegate.h"
 #include "chrome/browser/plugin_observer.h"
 #include "chrome/browser/profiles/profile.h"
@@ -21,6 +20,10 @@
 #include "net/url_request/url_request_context_getter.h"
 #include "webkit/plugins/npapi/default_plugin_shared.h"
 
+#if defined(OS_WIN)
+#include "chrome/browser/plugin_download_helper.h"
+#endif
+
 using content::BrowserThread;
 
 static const char kDefaultPluginFinderURL[] =
@@ -36,7 +39,7 @@
 bool ChromePluginMessageFilter::OnMessageReceived(const IPC::Message& message) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(ChromePluginMessageFilter, message)
-#if defined(OS_WIN) && !defined(USE_AURA)
+#if defined(OS_WIN)
     IPC_MESSAGE_HANDLER(ChromePluginProcessHostMsg_DownloadUrl, OnDownloadUrl)
 #endif
     IPC_MESSAGE_HANDLER(ChromePluginProcessHostMsg_GetPluginFinderUrl,
@@ -53,7 +56,7 @@
   return process_->Send(message);
 }
 
-#if defined(OS_WIN) && !defined(USE_AURA)
+#if defined(OS_WIN)
 void ChromePluginMessageFilter::OnDownloadUrl(const std::string& url,
                                               gfx::NativeWindow caller_window,
                                               int render_process_id) {