Have panels respond to changes in work area on Linux.

chrome/browser/extensions/extension_browser_event_router.h

Index: chrome/browser/extensions/extension_browser_event_router.h
diff --git a/chrome/browser/extensions/extension_browser_event_router.h b/chrome/browser/extensions/extension_browser_event_router.h
index ce3937bb136a6b5e0c1fcd722d7630c0dc14549d..f0f1703628437b76f65383ab1e8d06f6d7708261 100644
--- a/chrome/browser/extensions/extension_browser_event_router.h
+++ b/chrome/browser/extensions/extension_browser_event_router.h
@@ -18,7 +18,7 @@
 #if defined(TOOLKIT_VIEWS)
 #include "ui/views/focus/widget_focus_manager.h"
 #elif defined(TOOLKIT_GTK)
-#include "ui/base/x/active_window_watcher_x.h"
+#include "ui/base/x/active_window_watcher_x_observer.h"
 #endif
 
 // The ExtensionBrowserEventRouter listens to Browser window & tab events
@@ -30,7 +30,7 @@ class ExtensionBrowserEventRouter : public TabStripModelObserver,
 #if defined(TOOLKIT_VIEWS)
                                     public views::WidgetFocusChangeListener,
 #elif defined(TOOLKIT_GTK)
-                                    public ui::ActiveWindowWatcherX::Observer,
+                                    public ui::ActiveWindowWatcherXObserver,
 #endif
                                     public BrowserList::Observer,
                                     public content::NotificationObserver {