GTK Themes: Prevent colors from "leaking through" by using an event box.

chrome/browser/gtk/browser_toolbar_gtk.h

Index: chrome/browser/gtk/browser_toolbar_gtk.h
diff --git a/chrome/browser/gtk/browser_toolbar_gtk.h b/chrome/browser/gtk/browser_toolbar_gtk.h
index e6d76dc67174aa69ccfd694815142c51bbd07f6a..fefb000be65318466ee227f20cee1a3e5dd5972c 100644
--- a/chrome/browser/gtk/browser_toolbar_gtk.h
+++ b/chrome/browser/gtk/browser_toolbar_gtk.h
@@ -49,7 +49,7 @@ class BrowserToolbarGtk : public CommandUpdater::CommandObserver,
 
   // Getter for the containing widget.
   GtkWidget* widget() {
-    return toolbar_;
+    return event_box_;
   }
 
   virtual LocationBar* GetLocationBar() const;
@@ -152,6 +152,12 @@ class BrowserToolbarGtk : public CommandUpdater::CommandObserver,
   // Ninebox for the toolbar background
   scoped_ptr<NineBox> background_ninebox_;
 
+  // An event box that holds |toolbar_|. We need the toolbar to have its own
+  // GdkWindow when we use the GTK drawing because otherwise the color from our
+  // parent GdkWindow will leak through with some theme engines (such as
+  // Clearlooks).
+  GtkWidget* event_box_;
+
   // Gtk widgets. The toolbar is an hbox with each of the other pieces of the
   // toolbar placed side by side.
   GtkWidget* toolbar_;