Delete IsAtLeastOS10_9() and IsAtMostOS10_9()

chrome/browser/ui/cocoa/custom_frame_view.mm

 // Copyright (c) 2012 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.
 
 #import "chrome/browser/ui/cocoa/custom_frame_view.h"
 
 #import <Carbon/Carbon.h>
 #include <crt_externs.h>
 #import <objc/runtime.h>
 #include <string.h>
@@ skipping 32 matching lines @@
   const int argc = *_NSGetArgc();
   const char kType[] = "--type=";
   for (int i = 1; i < argc; ++i) {
     const char* arg = argv[i];
     if (strncmp(arg, kType, strlen(kType)) == 0)
       return;
   }
 
   // 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;
 
   base::mac::ScopedNSAutoreleasePool pool;
 
   // On 10.8+ the background for textured windows are no longer drawn by
   // NSGrayFrame, and NSThemeFrame is used instead <http://crbug.com/114745>.
   Class borderViewClass = NSClassFromString(@"NSThemeFrame");
   DCHECK(borderViewClass);
   if (!borderViewClass) return;
 
@@ skipping 38 matching lines @@
   if ([window respondsToSelector:@selector(fullScreenButtonOriginAdjustment)])
     offset = [window fullScreenButtonOriginAdjustment];
 
   NSPoint origin = [self _fullScreenButtonOriginOriginal];
   origin.x += offset.x;
   origin.y += offset.y;
   return origin;
 }
 
 @end