Enable disabled omnibox tests on aura

ui/views/controls/textfield/textfield_views_model.cc

 // Copyright (c) 2012 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 "ui/views/controls/textfield/textfield_views_model.h"
 
 #include <algorithm>
 
 #include "base/i18n/break_iterator.h"
 #include "base/logging.h"
@@ skipping 297 matching lines @@
 bool TextfieldViewsModel::SetText(const string16& text) {
   bool changed = false;
   if (HasCompositionText()) {
     ConfirmCompositionText();
     changed = true;
   }
   if (GetText() != text) {
     if (changed)  // No need to remember composition.
       Undo();
     size_t old_cursor = GetCursorPosition();
-    size_t new_cursor = old_cursor > text.length() ? text.length() : old_cursor;
+    // SetText moves the cursor to the end.
+    size_t new_cursor = text.length();
     SelectAll();
     // If there is a composition text, don't merge with previous edit.
     // Otherwise, force merge the edits.
     ExecuteAndRecordReplace(
         changed ? DO_NOT_MERGE : MERGE_WITH_PREVIOUS,
         old_cursor,
         new_cursor,
         text,
         0U);
     render_text_->SetCursorPosition(new_cursor);
@@ skipping 450 matching lines @@
   if (delete_from != delete_to)
     render_text_->SetText(text.erase(delete_from, delete_to - delete_from));
   if (!new_text.empty())
     render_text_->SetText(text.insert(new_text_insert_at, new_text));
   render_text_->SetCursorPosition(new_cursor_pos);
   // TODO(oshima): mac selects the text that is just undone (but gtk doesn't).
   // This looks fine feature and we may want to do the same.
 }
 
 }  // namespace views