Use CTFontCreateForString for RenderTextHarfbuzz on Mac

ui/gfx/font_fallback_win.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/font_fallback_win.h"
 
 #include <dwrite_2.h>
 #include <usp10.h>
 #include <wrl.h>
 
@@ skipping 323 matching lines @@
   // LinkedFontsIterator doesn't care about the font size, so we always pass 10.
   internal::LinkedFontsIterator linked_fonts(Font(font_family, 10));
   std::vector<Font> fallback_fonts;
   Font current;
   while (linked_fonts.NextFont(&current))
     fallback_fonts.push_back(current);
   return fallback_fonts;
 }
 
 bool GetFallbackFont(const Font& font,
-                     const wchar_t* text,
+                     const base::char16* text,
                      int text_length,
                      Font* result) {
   // Creating a DirectWrite font fallback can be expensive. It's ok in the
   // browser process because we can use the shared system fallback, but in the
   // renderer this can cause hangs. Code that needs font fallback in the
   // renderer should instead use the font proxy.
   DCHECK(base::MessageLoopForUI::IsCurrent());
 
   // Check that we have at least as much text as was claimed. If we have less
   // text than expected then DirectWrite will become confused and crash. This
@@ skipping 51 matching lines @@
     base::string16 name;
     if (FAILED(GetFamilyNameFromDirectWriteFont(mapped_font.Get(), &name)))
       return false;
     *result = Font(base::UTF16ToUTF8(name), font.GetFontSize() * scale);
     return true;
   }
   return false;
 }
 
 }  // namespace gfx