Applied review comments from oshima for CL 7850026.

chrome/browser/idle_linux.cc

 // Copyright (c) 2011 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/idle.h"
 
 #include "base/basictypes.h"
 #include "chrome/browser/idle_query_linux.h"
-#include "chrome/browser/screensaver_window_finder_linux.h"
+
+#if defined(USE_AURA)
+#include "chrome/browser/screensaver_window_finder_aura.h"
+#else
+#include "chrome/browser/screensaver_window_finder_gtk.h"

[oshima, 2011/09/20 04:59:18]

Doh, I was stupid. I thought ScreensaverWindowFinder is a shared class. Looks
like this is gtk only. My bad. You may revert this, and simply
return false in "bool CheckIdleStateIsLocked" and rename
screensaver_window_filter_linux.cc to gtk.cc. Sorry about that.

+#endif
 
 void CalculateIdleState(unsigned int idle_threshold, IdleCallback notify) {
   if (CheckIdleStateIsLocked()) {
     notify.Run(IDLE_STATE_LOCKED);
     return;
   }
   browser::IdleQueryLinux idle_query;
   unsigned int idle_time = idle_query.IdleTime();
   if (idle_time >= idle_threshold)
     notify.Run(IDLE_STATE_IDLE);
   else
     notify.Run(IDLE_STATE_ACTIVE);
 }
 
 bool CheckIdleStateIsLocked() {
   // Usually the screensaver is used to lock the screen, so we do not need to
   // check if the workstation is locked.
   return ScreensaverWindowFinder::ScreensaverWindowExists();
 }