Have panels respond to changes in work area on Linux.

ui/base/x/work_area_watcher_x_observer.cc

Index: ui/base/x/work_area_watcher_x_observer.cc
diff --git a/ui/base/x/work_area_watcher_x_observer.cc b/ui/base/x/work_area_watcher_x_observer.cc
new file mode 100644
index 0000000000000000000000000000000000000000..45da0f80e69f3a0a3ba94aec12d656c91568b684
--- /dev/null
+++ b/ui/base/x/work_area_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/work_area_watcher_x_observer.h"
+
+namespace ui {
+
+WorkAreaWatcherXObserver::~WorkAreaWatcherXObserver() {
+}
+
+}  // namespace ui