Remove unused and unnecessary constructor from PlatformFont classes.

ui/gfx/platform_font_pango.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_PLATFORM_FONT_PANGO_H_
 #define UI_GFX_PLATFORM_FONT_PANGO_H_
 #pragma once
 
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "third_party/skia/include/core/SkRefCnt.h"
 #include "ui/gfx/platform_font.h"
 
 class SkTypeface;
 class SkPaint;
 
 namespace gfx {
 
 class UI_EXPORT PlatformFontPango : public PlatformFont {
  public:
   PlatformFontPango();
-  explicit PlatformFontPango(const Font& other);
   explicit PlatformFontPango(NativeFont native_font);
   PlatformFontPango(const std::string& font_name, int font_size);
 
   // Converts |gfx_font| to a new pango font. Free the returned font with
   // pango_font_description_free().
   static PangoFontDescription* PangoFontFromGfxFont(const gfx::Font& gfx_font);
 
   // Resets and reloads the cached system font used by the default constructor.
   // This function is useful when the system font has changed, for example, when
   // the locale has changed.
@@ skipping 70 matching lines @@
   double underline_position_pixels_;
   double underline_thickness_pixels_;
 
   // The default font, used for the default constructor.
   static Font* default_font_;
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_PLATFORM_FONT_PANGO_H_