Allow build under GTK+ 2.24.

chrome/browser/ui/libgtk2ui/x11_input_method_context_impl_gtk2.cc

Index: chrome/browser/ui/libgtk2ui/x11_input_method_context_impl_gtk2.cc
diff --git a/chrome/browser/ui/libgtk2ui/x11_input_method_context_impl_gtk2.cc b/chrome/browser/ui/libgtk2ui/x11_input_method_context_impl_gtk2.cc
index d6e18f6427109a9e209b23bea398ab6bfe6dab3a..b4549925acce79fe9efb8f28f1f75957faf0292f 100644
--- a/chrome/browser/ui/libgtk2ui/x11_input_method_context_impl_gtk2.cc
+++ b/chrome/browser/ui/libgtk2ui/x11_input_method_context_impl_gtk2.cc
@@ -236,11 +236,19 @@ GdkEvent* X11InputMethodContextImplGtk2::GdkEventFromNativeEvent(
   g_free(keyvals);
   keyvals = NULL;
   // Get a GdkWindow.
+#if GTK_CHECK_VERSION(2,24,0)
   GdkWindow* window = gdk_x11_window_lookup_for_display(display, xkey.window);
+#else
+  GdkWindow* window = gdk_window_lookup_for_display(display, xkey.window);
+#endif
   if (window)
     g_object_ref(window);
   else
+#if GTK_CHECK_VERSION(2,24,0)
     window = gdk_x11_window_foreign_new_for_display(display, xkey.window);
+#else
+    window = gdk_window_foreign_new_for_display(display, xkey.window);
+#endif
   if (!window) {
     LOG(ERROR) << "Cannot get a GdkWindow for a key event.";
     return NULL;
@@ -348,7 +356,11 @@ void X11InputMethodContextImplGtk2::OnPreeditStart(GtkIMContext* context) {
 
 X11InputMethodContextImplGtk2::GtkCommitSignalTrap::GtkCommitSignalTrap()
     : is_trap_enabled_(false),
+#if GTK_CHECK_VERSION (2,22,0)
       gdk_event_key_keyval_(GDK_KEY_VoidSymbol),
+#else
+      gdk_event_key_keyval_(GDK_VoidSymbol),
+#endif
       is_signal_caught_(false) {}
 
 void X11InputMethodContextImplGtk2::GtkCommitSignalTrap::StartTrap(