mac: Remove IsOSLion().

ui/gfx/font_fallback_mac.mm

 // Copyright 2015 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.h"
 
 #include <dlfcn.h>
 #import <Foundation/Foundation.h>
 #include <string>
 #include <vector>
 
 #include "base/mac/foundation_util.h"
 #import "base/mac/mac_util.h"
 #import "base/strings/sys_string_conversions.h"
 #include "ui/gfx/font.h"
 
-// CTFontCopyDefaultCascadeListForLanguages() doesn't exist in the 10.6 SDK.
-// There is only the following. It doesn't exist in the public header files,
-// but is an exported symbol so should always link.
-extern "C" CFArrayRef CTFontCopyDefaultCascadeList(CTFontRef font_ref);
-
-namespace {
-
-// Wrapper for CTFontCopyDefaultCascadeListForLanguages() which should appear in
-// CoreText.h from 10.8 onwards.
-// TODO(tapted): Delete this wrapper when only 10.8+ is supported.
-CFArrayRef CTFontCopyDefaultCascadeListForLanguagesWrapper(
-    CTFontRef font_ref,
-    CFArrayRef language_pref_list) {
-  typedef CFArrayRef (*MountainLionPrototype)(CTFontRef, CFArrayRef);
-  static const MountainLionPrototype cascade_with_languages_function =
-      reinterpret_cast<MountainLionPrototype>(
-          dlsym(RTLD_DEFAULT, "CTFontCopyDefaultCascadeListForLanguages"));
-  if (cascade_with_languages_function)
-    return cascade_with_languages_function(font_ref, language_pref_list);
-
-  // Fallback to the 10.6 Private API.
-  DCHECK(base::mac::IsOSLionOrEarlier());
-  return CTFontCopyDefaultCascadeList(font_ref);
-}
-
-}  // namespace
+// TODO(thakis): Remove this prototype once the deployment target is 10.8+.
+extern "C" CFArrayRef CTFontCopyDefaultCascadeListForLanguages(
+    CTFontRef font,
+    CFArrayRef languagePrefList);
 
 namespace gfx {
 
 std::vector<Font> GetFallbackFonts(const Font& font) {
   // On Mac "There is a system default cascade list (which is polymorphic, based
   // on the user's language setting and current font)" - CoreText Programming
   // Guide.
   // The CoreText APIs provide CTFontCreateForString(font, string, range), but
   // it requires a text string "hint", and the returned font can't be
   // represented by name for easy retrieval later.
   // In 10.8, CTFontCopyDefaultCascadeListForLanguages(font, language_list)
   // showed up which is a good fit GetFallbackFonts().
   NSArray* languages = [[NSUserDefaults standardUserDefaults]
       stringArrayForKey:@"AppleLanguages"];
   CFArrayRef languages_cf = base::mac::NSToCFCast(languages);
   base::ScopedCFTypeRef<CFArrayRef> cascade_list(
-      CTFontCopyDefaultCascadeListForLanguagesWrapper(
+      CTFontCopyDefaultCascadeListForLanguages(
           static_cast<CTFontRef>(font.GetNativeFont()), languages_cf));
 
   std::vector<Font> fallback_fonts;
 
   const CFIndex fallback_count = CFArrayGetCount(cascade_list);
   for (CFIndex i = 0; i < fallback_count; ++i) {
     CTFontDescriptorRef descriptor =
         base::mac::CFCastStrict<CTFontDescriptorRef>(
             CFArrayGetValueAtIndex(cascade_list, i));
     base::ScopedCFTypeRef<CTFontRef> font(
         CTFontCreateWithFontDescriptor(descriptor, 0.0, nullptr));
     if (font.get())
       fallback_fonts.push_back(Font(static_cast<NSFont*>(font.get())));
   }
 
   if (fallback_fonts.empty())
     return std::vector<Font>(1, font);
 
   return fallback_fonts;
 }
 
 }  // namespace gfx