MacViews: Use RenderTextHarfBuzz only for Textfields

ui/gfx/render_text_mac.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/gfx/render_text_mac.h"
 
 #include <ApplicationServices/ApplicationServices.h>
 
 #include <algorithm>
 #include <cmath>
 #include <utility>
 
 #include "base/mac/foundation_util.h"
 #include "base/mac/scoped_cftyperef.h"
 #include "base/strings/sys_string_conversions.h"
 #include "skia/ext/skia_utils_mac.h"
 
 namespace gfx {
 
 RenderTextMac::RenderTextMac() : common_baseline_(0), runs_valid_(false) {
 }
 
 RenderTextMac::~RenderTextMac() {
 }
 
+scoped_ptr<RenderText> RenderTextMac::CreateInstanceOfSameType() const {
+  return scoped_ptr<RenderTextMac>(new RenderTextMac);
+}
+
 Size RenderTextMac::GetStringSize() {
   EnsureLayout();
   return Size(std::ceil(string_size_.width()), string_size_.height());
 }
 
 SizeF RenderTextMac::GetStringSizeF() {
   EnsureLayout();
   return string_size_;
 }
 
@@ skipping 301 matching lines @@
     run_origin.offset(run_width, 0);
   }
   runs_valid_ = true;
 }
 
 RenderText* RenderText::CreateNativeInstance() {
   return new RenderTextMac;
 }
 
 }  // namespace gfx