CoreAnimation: Fix text anti-aliasing in download shelf

chrome/browser/ui/cocoa/bookmarks/bookmark_button.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_button.h"
 
 #include <cmath>
 
 #include "base/logging.h"
 #include "base/mac/foundation_util.h"
@@ skipping 387 matching lines @@
   } else {
     // Mouse tracked out of button during menu track. Hide menus.
     if (!wasInside)
       [delegate_ bookmarkDragDidEnd:self
                           operation:NSDragOperationNone];
   }
   return kDraggableButtonMixinDidWork;
 }
 
 - (BOOL)isOpaque {
-  // Make this control opaque so that sub pixel anti aliasing works when core
-  // animation is enabled.
+  // Make this control opaque so that sub-pixel anti-aliasing works when
+  // CoreAnimation is enabled.
   return YES;
 }
 
 - (void)drawRect:(NSRect)rect {
-  NSView* toolbarView = [[self superview] superview];
-  [self cr_drawUsingAncestor:toolbarView inRect:(NSRect)rect];
+  NSView* bookmarkBarToolbarView = [[self superview] superview];
+  [self cr_drawUsingAncestor:bookmarkBarToolbarView inRect:(NSRect)rect];
   [super drawRect:rect];
 }
 
 @end
 
 @implementation BookmarkButton(Private)
 
 
 - (void)installCustomTrackingArea {
   const NSTrackingAreaOptions options =
@@ skipping 30 matching lines @@
   [[cell clipPathForFrame:bounds inView:self] setClip];
   [cell drawWithFrame:bounds inView:self];
 
   CGContextEndTransparencyLayer(cgContext);
   [image unlockFocus];
 
   return image.autorelease();
 }
 
 @end  // @implementation BookmarkButton(Private)