Have panels respond to changes in work area on Linux.

ui/base/x/active_window_watcher_x_observer.cc

Index: ui/base/x/active_window_watcher_x_observer.cc
diff --git a/ui/base/x/active_window_watcher_x_observer.cc b/ui/base/x/active_window_watcher_x_observer.cc
new file mode 100644
index 0000000000000000000000000000000000000000..acffbf93f5ce3a88a70ab0b6ecf38e6d0ed95c05
--- /dev/null
+++ b/ui/base/x/active_window_watcher_x_observer.cc
@@ -0,0 +1,12 @@
+// 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 "ui/base/x/active_window_watcher_x_observer.h"
+
+namespace ui {
+
+ActiveWindowWatcherXObserver::~ActiveWindowWatcherXObserver() {
+}
+
+}  // namespace ui