gfx_unittests builds on 10.13

ui/gfx/icc_profile_mac.mm

 // Copyright 2014 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/icc_profile.h"
 
 #include "base/mac/mac_util.h"
 #include "base/mac/scoped_cftyperef.h"
 
 namespace gfx {
 
 // static
 ICCProfile ICCProfile::FromBestMonitor() {
   return FromCGColorSpace(base::mac::GetSystemColorSpace());
 }
 
 // static
 ICCProfile ICCProfile::FromCGColorSpace(CGColorSpaceRef cg_color_space) {
   if (HasForcedProfile())
     return GetForcedProfile();
 
-  base::ScopedCFTypeRef<CFDataRef> cf_icc_profile(
-      CGColorSpaceCopyICCProfile(cg_color_space));
+  base::ScopedCFTypeRef<CFDataRef> cf_icc_profile;
+  if (__builtin_available(macOS 10.12, *)) {
+    cf_icc_profile.reset(CGColorSpaceCopyICCProfile(cg_color_space));
+  }
   if (!cf_icc_profile)
     return gfx::ICCProfile();
   size_t length = CFDataGetLength(cf_icc_profile);
   const unsigned char* data = CFDataGetBytePtr(cf_icc_profile);
   std::vector<char> vector_icc_profile;
   vector_icc_profile.assign(data, data + length);
   return FromData(vector_icc_profile.data(), vector_icc_profile.size());
 }
 
 }  // namespace gfx
+
+extern "C" {
+
+// This does not belong here..
+int32_t __isOSVersionAtLeast(int32_t Major, int32_t Minor, int32_t Subminor) {
+  return 0;
+}
+}