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

ui/views/cocoa/bridged_native_widget.mm

 // Copyright 2014 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 "ui/views/cocoa/bridged_native_widget.h"
 
 #import <objc/runtime.h>
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 764 matching lines @@
     UpdateLayerProperties();
     if ([window_ inLiveResize])
       MaybeWaitForFrame(new_size);
   }
 
   // 10.9 is unable to generate a window shadow from the composited CALayer, so
   // use Quartz.
   // We don't update the window mask during a live resize, instead it is done
   // after the resize is completed in viewDidEndLiveResize: in
   // BridgedContentView.
-  if (base::mac::IsOSMavericks() && ![window_ inLiveResize])
+  if (base::mac::IsOS10_9() && ![window_ inLiveResize])
     [bridged_view_ updateWindowMask];
 }
 
 void BridgedNativeWidget::OnPositionChanged() {
   native_widget_mac_->GetWidget()->OnNativeWidgetMove();
 }
 
 void BridgedNativeWidget::OnVisibilityChanged() {
   const bool window_visible = [window_ isVisible];
   if (window_visible_ == window_visible)
@@ skipping 176 matching lines @@
   // blocks the UI thread, so there's no way to invalidate the shadow to match
   // the composited layer. This assumes the native window shape is a good match
   // for the composited NonClientFrameView, which should be the case since the
   // native shape is what's most appropriate for displaying sheets on Mac.
   if (translucent && !native_widget_mac_->IsWindowModalSheet()) {
     [window_ setOpaque:NO];
     // For Mac OS versions earlier than Yosemite, the Window server isn't able
     // to generate a window shadow from the composited CALayer. To get around
     // this, let the window background remain opaque and clip the window
     // boundary in drawRect method of BridgedContentView. See crbug.com/543671.
-    if (base::mac::IsOSYosemiteOrLater())
+    if (base::mac::IsAtLeastOS10_10())
       [window_ setBackgroundColor:[NSColor clearColor]];
   }
 
   UpdateLayerProperties();
 }
 
 void BridgedNativeWidget::SetAssociationForView(const views::View* view,
                                                 NSView* native_view) {
   DCHECK_EQ(0u, associated_views_.count(view));
   associated_views_[view] = native_view;
@@ skipping 270 matching lines @@
     [compositor_superview_ setWantsBestResolutionOpenGLSurface:YES];
   }
 
   base::scoped_nsobject<CALayer> background_layer([[CALayer alloc] init]);
   [background_layer
       setAutoresizingMask:kCALayerWidthSizable | kCALayerHeightSizable];
 
   if (widget_type_ == Widget::InitParams::TYPE_MENU) {
     // Giving the canvas opacity messes up subpixel font rendering, so use a
     // solid background, but make the CALayer transparent.
-    if (base::mac::IsOSYosemiteOrLater()) {
+    if (base::mac::IsAtLeastOS10_10()) {
       [background_layer setOpacity:kYosemiteMenuOpacity];
       CGSSetWindowBackgroundBlurRadius(
           _CGSDefaultConnection(), [window_ windowNumber], kYosemiteMenuBlur);
       // The blur effect does not occur with a fully transparent (or fully
       // layer-backed) window. Setting a window background will use square
       // corners, so ask the contentView to draw one instead.
       [bridged_view_ setDrawMenuBackgroundForBlur:YES];
     } else {
       [background_layer setOpacity:kMavericksMenuOpacity];
     }
@@ skipping 81 matching lines @@
   [bridged_view_ setMouseDownCanMoveWindow:draggable];
   // AppKit will not update its cache of mouseDownCanMoveWindow unless something
   // changes. Previously we tried adding an NSView and removing it, but for some
   // reason it required reposting the mouse-down event, and didn't always work.
   // Calling the below seems to be an effective solution.
   [window_ setMovableByWindowBackground:NO];
   [window_ setMovableByWindowBackground:YES];
 }
 
 }  // namespace views