GTK: fix navigation button click logic.

chrome/browser/gtk/gtk_util.cc

 // Copyright (c) 2010 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/gtk_util.h"
 
 #include <gtk/gtk.h>
 #include <gdk/gdkx.h>
 
 #include <cstdarg>
@@ skipping 37 matching lines @@
 // difference is that they accept middle clicks.
 gboolean OnMouseButtonPressed(GtkWidget* widget, GdkEventButton* event,
                               gpointer userdata) {
   if (event->type == GDK_BUTTON_PRESS) {
     if (gtk_button_get_focus_on_click(GTK_BUTTON(widget)) &&
         !GTK_WIDGET_HAS_FOCUS(widget)) {
       gtk_widget_grab_focus(widget);
     }
 
     gint button_mask = GPOINTER_TO_INT(userdata);
-    if (button_mask && (1 << event->button))
+    if (button_mask & (1 << event->button))
       gtk_button_pressed(GTK_BUTTON(widget));
   }
 
   return TRUE;
 }
 
 gboolean OnMouseButtonReleased(GtkWidget* widget, GdkEventButton* event,
                                gpointer userdata) {
   gint button_mask = GPOINTER_TO_INT(userdata);
   if (button_mask && (1 << event->button))
@@ skipping 954 matching lines @@
   gint x = 0, y = 0, width = 1, height = 1;
   gtk_window_get_position(GTK_WINDOW(dialog), &x, &y);
   gtk_window_get_size(GTK_WINDOW(dialog), &width, &height);
 
   return gfx::Rect(x, y, width, height);
 }
 
 #endif
 
 }  // namespace gtk_util