gfx_unittests builds on 10.13

ui/gfx/mac/io_surface.cc

Index: ui/gfx/mac/io_surface.cc
diff --git a/ui/gfx/mac/io_surface.cc b/ui/gfx/mac/io_surface.cc
index 90dadff5dd1100e922b5953d115a89f68b93a763..4ecd2e26e3e1149723245e6e4515422b47643393 100644
--- a/ui/gfx/mac/io_surface.cc
+++ b/ui/gfx/mac/io_surface.cc
@@ -219,10 +219,12 @@ IOSurfaceRef CreateIOSurface(const gfx::Size& size, gfx::BufferFormat format) {
     CGColorSpaceRef color_space = color_correct_rendering_enabled
                                       ? base::mac::GetSRGBColorSpace()
                                       : base::mac::GetSystemColorSpace();
-    base::ScopedCFTypeRef<CFDataRef> color_space_icc(
-        CGColorSpaceCopyICCProfile(color_space));
-    // Note that nullptr is an acceptable input to IOSurfaceSetValue.
-    IOSurfaceSetValue(surface, CFSTR("IOSurfaceColorSpace"), color_space_icc);
+    if (__builtin_available(macOS 10.12, *)) {
+      base::ScopedCFTypeRef<CFDataRef> color_space_icc(
+          CGColorSpaceCopyICCProfile(color_space));
+      // Note that nullptr is an acceptable input to IOSurfaceSetValue.
+      IOSurfaceSetValue(surface, CFSTR("IOSurfaceColorSpace"), color_space_icc);
+    }
   }
 
   UMA_HISTOGRAM_TIMES("GPU.IOSurface.CreateTime",