Mac: restore subpixel AA in the find bar when it doesn't have focus

ui/base/cocoa/controls/blue_label_button.mm

Index: ui/base/cocoa/controls/blue_label_button.mm
diff --git a/ui/base/cocoa/controls/blue_label_button.mm b/ui/base/cocoa/controls/blue_label_button.mm
index d6021460b4622022d257c94b0d11d7094d06bc7f..319fff85a54fb51fcb4a35c48bf87f2e48156876 100644
--- a/ui/base/cocoa/controls/blue_label_button.mm
+++ b/ui/base/cocoa/controls/blue_label_button.mm
@@ -7,6 +7,7 @@
 #include "base/mac/foundation_util.h"
 #include "skia/ext/skia_utils_mac.h"
 #include "third_party/skia/include/core/SkColor.h"
+#include "ui/base/cocoa/scoped_cg_context_smooth_fonts.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/gfx/scoped_ns_graphics_context_save_gstate_mac.h"
 
@@ -93,13 +94,7 @@ const SkColor kPressOuterRingColor = SkColorSetRGB(0x23, 0x52, 0xa2);
   // Fuzz factor to adjust for the drop shadow. Based on visual inspection.
   frame.origin.y -= 1;
 
-  // Ensure LCD font smoothing is enabled when layer backed.
-  // This is safe to do because we know we are drawing on an opaque background.
-  gfx::ScopedNSGraphicsContextSaveGState scopedGState;
-  NSGraphicsContext* context = [NSGraphicsContext currentContext];
-  CGContextRef cgContext = static_cast<CGContextRef>([context graphicsPort]);
-  CGContextSetShouldSmoothFonts(cgContext, true);
-
+  ui::ScopedCGContextSmoothFonts fontSmoothing;
   NSAttributedString* attributedTitle =
       [[self class] generateAttributedString:[self title]];
   [attributedTitle drawInRect:frame];