Remove unused and unnecessary constructor from PlatformFont classes.

ui/gfx/platform_font_pango.cc

Index: ui/gfx/platform_font_pango.cc
===================================================================
--- ui/gfx/platform_font_pango.cc	(revision 132062)
+++ ui/gfx/platform_font_pango.cc	(working copy)
@@ -110,11 +110,6 @@
       static_cast<PlatformFontPango*>(default_font_->platform_font()));
 }
 
-PlatformFontPango::PlatformFontPango(const Font& other) {
-  InitFromPlatformFont(
-      static_cast<PlatformFontPango*>(other.platform_font()));
-}
-
 PlatformFontPango::PlatformFontPango(NativeFont native_font) {
   std::vector<std::string> family_names;
   base::SplitString(pango_font_description_get_family(native_font), ',',
@@ -391,11 +386,6 @@
 }
 
 // static
-PlatformFont* PlatformFont::CreateFromFont(const Font& other) {
-  return new PlatformFontPango(other);
-}
-
-// static
 PlatformFont* PlatformFont::CreateFromNativeFont(NativeFont native_font) {
   return new PlatformFontPango(native_font);
 }