Delete IsAtLeastOS10_9() and IsAtMostOS10_9()

ui/base/cocoa/base_view.mm

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/base/cocoa/base_view.h"
 
 #include "base/mac/mac_util.h"
 
 NSString* kViewDidBecomeFirstResponder =
     @"Chromium.kViewDidBecomeFirstResponder";
@@ skipping 43 matching lines @@
 }
 
 - (void)updateTrackingAreas {
   [super updateTrackingAreas];
 
   // NSTrackingInVisibleRect doesn't work correctly with Lion's window resizing,
   // http://crbug.com/176725 / http://openradar.appspot.com/radar?id=2773401 .
   // 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];
   }
 }
 
 - (void)mouseEvent:(NSEvent*)theEvent {
   // This method left intentionally blank.
 }
 
 - (EventHandled)keyEvent:(NSEvent*)theEvent {
@@ skipping 119 matching lines @@
   return new_rect;
 }
 
 - (NSRect)flipRectToNSRect:(gfx::Rect)rect {
   NSRect new_rect(NSRectFromCGRect(rect.ToCGRect()));
   new_rect.origin.y = NSHeight([self bounds]) - NSMaxY(new_rect);
   return new_rect;
 }
 
 @end