Modernize CoreText version checks

CTGetCoreTextVersion is deprecated as of macOS Big Sur. The recommended
replacement is normal version checks, so migrate to the standard
Chromium base::mac::IsOS() checks.

Bug: none
Change-Id: I782dd440d7fd04829eae4860cb57c7f7d1ffdb73
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2351161
Commit-Queue: Dominik Röttsches <drott@chromium.org>
Reviewed-by: Dominik Röttsches <drott@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797229}

third_party/blink/renderer/platform/fonts/mac/core_text_font_format_support.cc

@@ -4,27 +4,18 @@
 
 #include "third_party/blink/renderer/platform/fonts/mac/core_text_font_format_support.h"
 
-#include <CoreText/CoreText.h>
+#include "base/mac/mac_util.h"
 
 namespace blink {
 
-// Compare CoreText.h in an up to date SDK, redefining here since we don't seem
-// to have access to this value when building against the 10.10 SDK in our
-// standard Chrome build configuration.
-// static const uint32_t kBlinkLocalCTVersionNumber10_12 = 0x00090000;
-static const uint32_t kBlinkLocalCTVersionNumber10_13 = 0x000A0000;
-static const uint32_t kBlinkLocalCTVersionNumber10_14 = 0x000B0000;
-
 bool CoreTextVersionSupportsVariations() {
-  return &CTGetCoreTextVersion &&
-         CTGetCoreTextVersion() >= kBlinkLocalCTVersionNumber10_14;
+  return base::mac::IsAtLeastOS10_14();
 }
 
 // CoreText versions below 10.13 display COLR cpal as black/foreground-color
 // glyphs and do not interpret color glyph layers correctly.
 bool CoreTextVersionSupportsColrCpal() {
-  return &CTGetCoreTextVersion &&
-         CTGetCoreTextVersion() >= kBlinkLocalCTVersionNumber10_13;
+  return base::mac::IsAtLeastOS10_13();
 }
 
 }  // namespace blink