Landing http://codereview.chromium.org/3387008 for sadrul:

chrome/browser/autocomplete/autocomplete_edit_view_gtk.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/autocomplete/autocomplete_edit_view_gtk.h"
 
 #include <gtk/gtk.h>
 #include <gdk/gdkkeysyms.h>
 
 #include <algorithm>
@@ skipping 14 matching lines @@
 #include "chrome/browser/gtk/view_id_util.h"
 #include "chrome/browser/tab_contents/tab_contents.h"
 #include "chrome/browser/toolbar_model.h"
 #include "chrome/common/notification_service.h"
 #include "gfx/font.h"
 #include "gfx/gtk_util.h"
 #include "gfx/skia_utils_gtk.h"
 #include "googleurl/src/gurl.h"
 #include "grit/generated_resources.h"
 #include "net/base/escape.h"
+#include "third_party/undoview/undo_view.h"
 
 #if defined(TOOLKIT_VIEWS)
 #include "chrome/browser/views/autocomplete/autocomplete_popup_contents_view.h"
 #include "chrome/browser/views/location_bar/location_bar_view.h"
 #else
 #include "chrome/browser/autocomplete/autocomplete_popup_view_gtk.h"
 #include "chrome/browser/gtk/gtk_theme_provider.h"
 #include "chrome/browser/gtk/location_bar_view_gtk.h"
 #endif
 
@@ skipping 164 matching lines @@
   alignment_.Own(gtk_alignment_new(0., 0.5, 1.0, 0.0));
   gtk_widget_set_name(alignment_.get(),
                       "chrome-autocomplete-edit-view");
 
   // The GtkTagTable and GtkTextBuffer are not initially unowned, so we have
   // our own reference when we create them, and we own them.  Adding them to
   // the other objects adds a reference; it doesn't adopt them.
   tag_table_ = gtk_text_tag_table_new();
   text_buffer_ = gtk_text_buffer_new(tag_table_);
   g_object_set_data(G_OBJECT(text_buffer_), kAutocompleteEditViewGtkKey, this);
-  text_view_ = gtk_text_view_new_with_buffer(text_buffer_);
+  text_view_ = gtk_undo_view_new(text_buffer_);
   if (popup_window_mode_)
     gtk_text_view_set_editable(GTK_TEXT_VIEW(text_view_), false);
 
   // One pixel left margin is necessary to make the cursor visible when UI
   // language direction is LTR but |text_buffer_|'s content direction is RTL.
   gtk_text_view_set_left_margin(GTK_TEXT_VIEW(text_view_), 1);
 
   // See SetEntryStyle() comments.
   gtk_widget_set_name(text_view_, "chrome-location-bar-entry");
 
@@ skipping 1367 matching lines @@
   CharRange selection = GetSelection();
   GURL url;
   bool write_url;
   model_->AdjustTextForCopy(selection.selection_min(), IsSelectAll(), &text,
                             &url, &write_url);
   if (write_url) {
     selected_text_ = WideToUTF8(text);
     OwnPrimarySelection(selected_text_);
   }
 }