base::mac::IsOSSierra() -> base::mac::IsOS10_12(), etc.

chrome/browser/ui/cocoa/bookmarks/bookmark_bar_controller.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/bookmarks/bookmark_bar_controller.h"
 
 #include <stddef.h>
 
 #import "base/mac/bundle_locations.h"
 #import "base/mac/foundation_util.h"
@@ skipping 450 matching lines @@
 }
 
 - (void)awakeFromNib {
   [self viewDidLoad];
 }
 
 - (void)viewDidLoad {
   if (bridge_) {
     // When running on 10.10, expect both -awakeFromNib and -viewDidLoad to be
     // called, but only initialize once.
-    DCHECK(base::mac::IsOSYosemiteOrLater());
+    DCHECK(base::mac::IsAtLeastOS10_10());
     return;
   }
 
   // We default to NOT open, which means height=0.
   DCHECK([[self view] isHidden]);  // Hidden so it's OK to change.
 
   // Set our initial height to zero, since that is what the superview
   // expects.  We will resize ourselves open later if needed.
   [[self view] setFrame:NSMakeRect(0, 0, initialWidth_, 0)];
 
@@ skipping 2603 matching lines @@
 - (id<BookmarkButtonControllerProtocol>)controllerForNode:
     (const BookmarkNode*)node {
   // See if it's in the bar, then if it is in the hierarchy of visible
   // folder menus.
   if (bookmarkModel_->bookmark_bar_node() == node)
     return self;
   return [folderController_ controllerForNode:node];
 }
 
 @end