Delete IsAtLeastOS10_9() and IsAtMostOS10_9()

chrome/browser/ui/cocoa/browser_window_controller_private.mm

Index: chrome/browser/ui/cocoa/browser_window_controller_private.mm
diff --git a/chrome/browser/ui/cocoa/browser_window_controller_private.mm b/chrome/browser/ui/cocoa/browser_window_controller_private.mm
index dfbe07d60f91eb4b97418ad48cea6a36e45a9829..8b43548fc855410a81a9d00368153385fc0f0e31 100644
--- a/chrome/browser/ui/cocoa/browser_window_controller_private.mm
+++ b/chrome/browser/ui/cocoa/browser_window_controller_private.mm
@@ -1116,7 +1116,7 @@ willPositionSheet:(NSWindow*)sheet
 }
 
 + (BOOL)systemSettingsRequireMavericksAppKitFullscreenHack {
-  if (!base::mac::IsOS10_9())
+  if (base::mac::IsAtLeastOS10_10())
     return NO;
   return [NSScreen respondsToSelector:@selector(screensHaveSeparateSpaces)] &&
          [NSScreen screensHaveSeparateSpaces];
@@ -1135,7 +1135,7 @@ willPositionSheet:(NSWindow*)sheet
 
 - (BOOL)shouldUseCustomAppKitFullscreenTransition:(BOOL)enterFullScreen {
   // Disable the custom exit animation in OSX 10.9: http://crbug.com/526327#c3.
-  if (base::mac::IsOS10_9() && !enterFullScreen)
+  if (!base::mac::IsAtLeastOS10_10() && !enterFullScreen)
     return NO;
 
   NSView* root = [[self.window contentView] superview];