Remove unused and unnecessary constructor from PlatformFont classes.

ui/gfx/platform_font_mac.mm

 // 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/platform_font_mac.h"
 
 #include <Cocoa/Cocoa.h>
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_nsobject.h"
 #include "base/sys_string_conversions.h"
 #include "base/utf_string_conversions.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/font.h"
 
 namespace gfx {
 
 ////////////////////////////////////////////////////////////////////////////////
 // PlatformFontMac, public:
 
 PlatformFontMac::PlatformFontMac() {
   font_size_ = [NSFont systemFontSize];
   style_ = gfx::Font::NORMAL;
   NSFont* system_font = [NSFont systemFontOfSize:font_size_];
   font_name_ = base::SysNSStringToUTF8([system_font fontName]);
   CalculateMetrics();
 }
 
-PlatformFontMac::PlatformFontMac(const Font& other) {
-}
-
 PlatformFontMac::PlatformFontMac(NativeFont native_font) {
 }
 
 PlatformFontMac::PlatformFontMac(const std::string& font_name,
                                  int font_size) {
   InitWithNameSizeAndStyle(font_name, font_size, gfx::Font::NORMAL);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // PlatformFontMac, PlatformFont implementation:
@@ skipping 73 matching lines @@
 
 ////////////////////////////////////////////////////////////////////////////////
 // PlatformFont, public:
 
 // static
 PlatformFont* PlatformFont::CreateDefault() {
   return new PlatformFontMac;
 }
 
 // static
-PlatformFont* PlatformFont::CreateFromFont(const Font& other) {
-  return new PlatformFontMac(other);
-}
-
-// static
 PlatformFont* PlatformFont::CreateFromNativeFont(NativeFont native_font) {
   return new PlatformFontMac(native_font);
 }
 
 // static
 PlatformFont* PlatformFont::CreateFromNameAndSize(const std::string& font_name,
                                                   int font_size) {
   return new PlatformFontMac(font_name, font_size);
 }
 
 }  // namespace gfx