Delete IsAtLeastOS10_9() and IsAtMostOS10_9()

ui/gl/test/gl_image_test_template.h

Index: ui/gl/test/gl_image_test_template.h
diff --git a/ui/gl/test/gl_image_test_template.h b/ui/gl/test/gl_image_test_template.h
index f12bafbe9d527006bcdb357089fa62d8a0ddedea..cdd4fbab7803a3d244366074185b06c639587ba8 100644
--- a/ui/gl/test/gl_image_test_template.h
+++ b/ui/gl/test/gl_image_test_template.h
@@ -223,14 +223,11 @@ TYPED_TEST_CASE_P(GLImageZeroInitializeTest);
 
 TYPED_TEST_P(GLImageZeroInitializeTest, ZeroInitialize) {
 #if defined(OS_MACOSX)
-  // This functionality is disabled on Mavericks because it breaks PDF
-  // rendering. https://crbug.com/594343.
-  if (base::mac::IsOS10_9())
-    return;
-
-  // This functionality is disabled on Yosemite because it is suspected of
-  // causing performance regressions on old hardware. https://crbug.com/606850.
-  if (base::mac::IsOS10_10())
+  // This functionality is disabled on Mavericks and Yosemite because…
+  // - On Mavericks, it breaks PDF rendering: https://crbug.com/594343.
+  // - On Yosemite, it is suspected of causing performance regressions on old
+  //   hardware: https://crbug.com/606850.
+  if (!base::mac::IsAtLeastOS10_11())
     return;
 #endif