Un-hover the current highlighted tab when the mouse leaves the tabstrip.

chrome/browser/gtk/tabs/tab_strip_gtk.h

 // Copyright (c) 2009 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.
 
 #ifndef CHROME_BROWSER_GTK_TABS_TAB_STRIP_GTK_H_
 #define CHROME_BROWSER_GTK_TABS_TAB_STRIP_GTK_H_
 
 #include <gtk/gtk.h>
 #include <vector>
 
@@ skipping 61 matching lines @@
                               TabStripGtk* tabstrip);
 
   // motion-notify-event handler that handles mouse movement in the tabstrip.
   static gboolean OnMotionNotify(GtkWidget* widget, GdkEventMotion* event,
                                  TabStripGtk* tabstrip);
 
   // button-press-event handler that handles mouse clicks.
   static gboolean OnButtonPress(GtkWidget* widget, GdkEventButton* event,
                                 TabStripGtk* tabstrip);
 
+  // leave-notify-event handler that signals when the mouse leaves the tabstrip.
+  static gboolean OnLeaveNotify(GtkWidget* widget, GdkEventCrossing* event,
+                                TabStripGtk* tabstrip);
+
   // Gets the number of Tabs in the collection.
   int GetTabCount() const;
 
   // Retrieves the Tab at the specified index.
   TabGtk* GetTabAt(int index) const;
 
   // Returns the exact (unrounded) current width of each tab.
   void GetCurrentTabWidths(double* unselected_width,
                            double* selected_width) const;
 
@@ skipping 57 matching lines @@
   gfx::Rect bounds_;
 
   // Our model.
   TabStripModel* model_;
 
   // The index of the tab the mouse is currently over.  -1 if not over a tab.
   int hover_index_;
 };
 
 #endif  // CHROME_BROWSER_GTK_TABS_TAB_STRIP_GTK_H_