revert 22226 as it caused some ui test crashes

chrome/browser/gtk/infobar_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/infobar_gtk.h"
 
 #include <gtk/gtk.h>
 
 #include "base/gfx/gtk_util.h"
 #include "base/string_util.h"
@@ skipping 166 matching lines @@
   LinkInfoBar(LinkInfoBarDelegate* delegate)
       : InfoBar(delegate) {
     size_t link_offset;
     std::wstring display_text =
         delegate->GetMessageTextWithOffset(&link_offset);
     std::wstring link_text = delegate->GetLinkText();
 
     // Create the link button.
     GtkWidget* link_button =
         gtk_chrome_link_button_new(WideToUTF8(link_text).c_str());
-    gtk_chrome_link_button_set_use_gtk_theme(
-        GTK_CHROME_LINK_BUTTON(link_button), FALSE);
     g_signal_connect(link_button, "clicked",
                      G_CALLBACK(OnLinkClick), this);
 
     // If link_offset is npos, we right-align the link instead of embedding it
     // in the text.
     if (link_offset == std::wstring::npos) {
       gtk_box_pack_end(GTK_BOX(hbox_), link_button, FALSE, FALSE, 0);
       GtkWidget* label = gtk_label_new(WideToUTF8(display_text).c_str());
       gtk_widget_modify_fg(label, GTK_STATE_NORMAL, &gfx::kGdkBlack);
       gtk_box_pack_start(GTK_BOX(hbox_), label, FALSE, FALSE, 0);
@@ skipping 84 matching lines @@
 
 InfoBar* LinkInfoBarDelegate::CreateInfoBar() {
   return new LinkInfoBar(this);
 }
 
 // ConfirmInfoBarDelegate, InfoBarDelegate overrides: --------------------------
 
 InfoBar* ConfirmInfoBarDelegate::CreateInfoBar() {
   return new ConfirmInfoBar(this);
 }