mac: [Yosemite] Remove unnecessary AppKit private method swizzling.

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 71 matching lines @@
                                           @selector(drawRect:));
       Method m2 = class_getInstanceMethod(borderViewClass,
                                           @selector(drawRectOriginal:));
       DCHECK(m1 && m2);
       if (m1 && m2) {
         method_exchangeImplementations(m1, m2);
       }
     }
   }
 
-  // Swizzle the method that sets the origin for the Lion fullscreen button. Do
-  // nothing if it cannot be found.
-  m0 = class_getInstanceMethod([self class],
-                               @selector(_fullScreenButtonOrigin));
-  if (m0) {
-    BOOL didAdd = class_addMethod(borderViewClass,
-                                  @selector(_fullScreenButtonOriginOriginal),
-                                  method_getImplementation(m0),
-                                  method_getTypeEncoding(m0));
-    if (didAdd) {
-      Method m1 = class_getInstanceMethod(borderViewClass,
-                                          @selector(_fullScreenButtonOrigin));
-      Method m2 = class_getInstanceMethod(borderViewClass,
-          @selector(_fullScreenButtonOriginOriginal));
-      if (m1 && m2) {
-        method_exchangeImplementations(m1, m2);
+  // In Yosemite, the fullscreen button replaces the zoom button. We no longer
+  // need to swizzle out this AppKit private method.
+  if (base::mac::IsOSMavericksOrEarlier()) {
+    // Swizzle the method that sets the origin for the Lion fullscreen button.
+    // Do nothing if it cannot be found.
+    m0 = class_getInstanceMethod([self class],
+                                 @selector(_fullScreenButtonOrigin));
+    if (m0) {
+      BOOL didAdd = class_addMethod(borderViewClass,
+                                    @selector(_fullScreenButtonOriginOriginal),
+                                    method_getImplementation(m0),
+                                    method_getTypeEncoding(m0));
+      if (didAdd) {
+        Method m1 = class_getInstanceMethod(borderViewClass,
+                                            @selector(_fullScreenButtonOrigin));
+        Method m2 = class_getInstanceMethod(
+            borderViewClass, @selector(_fullScreenButtonOriginOriginal));
+        if (m1 && m2) {
+          method_exchangeImplementations(m1, m2);
+        }
       }
     }
   }
 }
 
 + (BOOL)canDrawTitle {
   return gCanDrawTitle;
 }
 
 + (BOOL)canGetCornerRadius {
@@ skipping 27 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