Delete IsAtLeastOS10_9() and IsAtMostOS10_9()

ui/base/cocoa/base_view.mm

Index: ui/base/cocoa/base_view.mm
diff --git a/ui/base/cocoa/base_view.mm b/ui/base/cocoa/base_view.mm
index 47ccca96ad6dd866b986183dbbec4db376f85be6..70f47052b4fd509425a0a05a07df9d46c4492335 100644
--- a/ui/base/cocoa/base_view.mm
+++ b/ui/base/cocoa/base_view.mm
@@ -61,7 +61,7 @@ NSString* kSelectionDirection = @"Chromium.kSelectionDirection";
   // Work around it by reinstalling the tracking area after window resize.
   // This AppKit bug is fixed on Yosemite, so we only apply this workaround on
   // 10.9.
-  if (base::mac::IsOS10_9()) {
+  if (!base::mac::IsAtLeastOS10_10()) {
     [self disableTracking];
     [self enableTracking];
   }