MacViews: Use RenderTextHarfBuzz only for Textfields

ui/views/controls/textfield/textfield_model.cc

 // Copyright 2014 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_model.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 #include "base/stl_util.h"
@@ skipping 260 matching lines @@
 using internal::FORCE_MERGE;
 using internal::MERGEABLE;
 
 /////////////////////////////////////////////////////////////////
 // TextfieldModel: public
 
 TextfieldModel::Delegate::~Delegate() {}
 
 TextfieldModel::TextfieldModel(Delegate* delegate)
     : delegate_(delegate),
-      render_text_(gfx::RenderText::CreateInstance()),
+      render_text_(gfx::RenderText::CreateInstanceForEditing()),
       current_edit_(edit_history_.end()) {
 }
 
 TextfieldModel::~TextfieldModel() {
   ClearEditHistory();
   ClearComposition();
 }
 
 bool TextfieldModel::SetText(const base::string16& new_text) {
   bool changed = false;
@@ skipping 468 matching lines @@
   ClearComposition();
   if (delete_from != delete_to)
     render_text_->SetText(old_text.erase(delete_from, delete_to - delete_from));
   if (!new_text.empty())
     render_text_->SetText(old_text.insert(new_text_insert_at, new_text));
   render_text_->SetCursorPosition(new_cursor_pos);
   // TODO(oshima): Select text that was just undone, like Mac (but not GTK).
 }
 
 }  // namespace views