Revert of Use CTFontCreateForString for RenderTextHarfbuzz on Mac

ui/gfx/font_fallback_win.h

 // 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.
 
 #ifndef UI_GFX_FONT_FALLBACK_WIN_H_
 #define UI_GFX_FONT_FALLBACK_WIN_H_
 
 #include <stddef.h>
 
 #include <string>
@@ skipping 63 matching lines @@
   const std::vector<Font>* linked_fonts_;
 
   // Index of the current entry in the |linked_fonts_| list.
   size_t linked_font_index_;
 
   DISALLOW_COPY_AND_ASSIGN(LinkedFontsIterator);
 };
 
 }  // namespace internal
 
+// Finds a fallback font to render the specified |text| with respect to an
+// initial |font|. Returns the resulting font via out param |result|. Returns
+// |true| if a fallback font was found.
+bool GFX_EXPORT GetFallbackFont(const Font& font,
+                                const wchar_t* text,
+                                int text_length,
+                                Font* result);
+
 }  // namespace gfx
 
 #endif  // UI_GFX_FONT_FALLBACK_WIN_H_