GTK: touch up appearance of browser actions badge....

chrome/browser/gtk/browser_actions_toolbar_gtk.cc

 // 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.
 
 #include "chrome/browser/gtk/browser_actions_toolbar_gtk.h"
 
 #include <gtk/gtk.h>
 #include <vector>
 
 #include "app/gfx/canvas_paint.h"
@@ skipping 97 matching lines @@
     UpdateState();
   }
 
   // Updates the button based on the latest state from the associated
   // browser action.
   void UpdateState() {
     int tab_id = toolbar_->GetCurrentTabId();
     if (tab_id < 0)
       return;
 
-    gtk_widget_set_tooltip_text(button_.get(),
-        extension_->browser_action()->GetTitle(tab_id).c_str());
+    std::string tooltip = extension_->browser_action()->GetTitle(tab_id);
+    if (tooltip.empty())
+      gtk_widget_set_has_tooltip(button_.get(), FALSE);
+    else
+      gtk_widget_set_tooltip_text(button_.get(), tooltip.c_str());
 
     SkBitmap image = extension_->browser_action()->GetIcon(tab_id);
     if (!image.isNull()) {
       GdkPixbuf* previous_gdk_icon = tab_specific_icon_;
       tab_specific_icon_ = gfx::GdkPixbufFromSkBitmap(&image);
       SetImage(tab_specific_icon_);
       if (previous_gdk_icon)
         g_object_unref(previous_gdk_icon);
     } else if (default_icon_) {
       SetImage(default_icon_);
@@ skipping 143 matching lines @@
   if (extension_button_map_.erase(extension->id()))
     UpdateVisibility();
 }
 
 void BrowserActionsToolbarGtk::UpdateVisibility() {
   if (button_count() == 0)
     gtk_widget_hide(widget());
   else
     gtk_widget_show(widget());
 }