Update internal state on undo to avoid a crash.

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 1684 matching lines @@
   DCHECK(clipboard);
   if (!clipboard)
     return;
 
   gtk_clipboard_set_text(
       clipboard, selected_text.data(), selected_text.size());
 }
 
 void AutocompleteEditViewGtk::SetTextAndSelectedRange(const std::wstring& text,
                                                       const CharRange& range) {
-  std::string utf8 = WideToUTF8(text);
-  gtk_text_buffer_set_text(text_buffer_, utf8.data(), utf8.length());
+  if (text != GetText()) {
+    std::string utf8 = WideToUTF8(text);
+    gtk_text_buffer_set_text(text_buffer_, utf8.data(), utf8.length());
+  }
   SetSelectedRange(range);
   AdjustTextJustification();
 }
 
 void AutocompleteEditViewGtk::SetSelectedRange(const CharRange& range) {
   GtkTextIter insert, bound;
   ItersFromCharRange(range, &bound, &insert);
   gtk_text_buffer_select_range(text_buffer_, &insert, &bound);
 
   // This should be set *after* setting the selection range, in case setting the
@@ skipping 202 matching lines @@
   // baseline, so we need to move the |instant_view_| down to make sure it
   // has the same baseline as the |text_view_|.
   PangoLayout* layout = gtk_label_get_layout(GTK_LABEL(instant_view_));
   int height;
   pango_layout_get_size(layout, NULL, &height);
   PangoLayoutIter* iter = pango_layout_get_iter(layout);
   int baseline = pango_layout_iter_get_baseline(iter);
   pango_layout_iter_free(iter);
   g_object_set(instant_anchor_tag_, "rise", baseline - height, NULL);
 }