Delete IsAtLeastOS10_9() and IsAtMostOS10_9()

chrome/browser/ui/cocoa/custom_frame_view_unittest.mm

Index: chrome/browser/ui/cocoa/custom_frame_view_unittest.mm
diff --git a/chrome/browser/ui/cocoa/custom_frame_view_unittest.mm b/chrome/browser/ui/cocoa/custom_frame_view_unittest.mm
index 33339ada746943a6a143102cfb2033669f313fae..aa061008091d9dbf9891f25378315cd7499171ec 100644
--- a/chrome/browser/ui/cocoa/custom_frame_view_unittest.mm
+++ b/chrome/browser/ui/cocoa/custom_frame_view_unittest.mm
@@ -28,7 +28,7 @@ class CustomFrameViewTest : public PlatformTest {
 TEST_F(CustomFrameViewTest, SuccessfulClassModifications) {
   // In Yosemite, the fullscreen button replaces the zoom button. We no longer
   // need to swizzle out this AppKit private method.
-  if (!base::mac::IsOS10_9())
+  if (base::mac::IsAtLeastOS10_10())
     return;
 
   unsigned int count;