base::mac::IsOSSierra() -> base::mac::IsOS10_12(), etc.

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 13b65aad740039f03fc98d58541ad9a34b40756a..3560790b28138f1b11f1145ec5024cd31562edc6 100644
--- a/ui/gfx/mac/io_surface.cc
+++ b/ui/gfx/mac/io_surface.cc
@@ -164,7 +164,7 @@ IOSurfaceRef CreateIOSurface(const gfx::Size& size, gfx::BufferFormat format) {
   // https://crbug.com/594343.
   // IOSurface clearing causes significant performance regression on about half
   // of all devices running Yosemite. https://crbug.com/606850#c22.
-  bool should_clear = !base::mac::IsOSMavericks() && !base::mac::IsOSYosemite();
+  bool should_clear = !base::mac::IsOS10_9() && !base::mac::IsOS10_10();
 
   if (should_clear) {
     // Zero-initialize the IOSurface. Calling IOSurfaceLock/IOSurfaceUnlock