mac: Update clients of scoped_nsobject.h.

ui/gfx/platform_font_mac.mm

Index: ui/gfx/platform_font_mac.mm
diff --git a/ui/gfx/platform_font_mac.mm b/ui/gfx/platform_font_mac.mm
index eff0c0f0c01e71859255f7c368763fa607ce45c4..bf0c0bd54acaaf13d5928942cd8a169b69a47d63 100644
--- a/ui/gfx/platform_font_mac.mm
+++ b/ui/gfx/platform_font_mac.mm
@@ -7,7 +7,7 @@
 #include <Cocoa/Cocoa.h>
 
 #include "base/basictypes.h"
-#include "base/memory/scoped_nsobject.h"
+#include "base/mac/scoped_nsobject.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "ui/gfx/canvas.h"
@@ -124,7 +124,7 @@ void PlatformFontMac::InitWithNameSizeAndStyle(const std::string& font_name,
 
 void PlatformFontMac::CalculateMetrics() {
   NSFont* font = GetNativeFont();
-  scoped_nsobject<NSLayoutManager> layout_manager(
+  base::scoped_nsobject<NSLayoutManager> layout_manager(
       [[NSLayoutManager alloc] init]);
   height_ = [layout_manager defaultLineHeightForFont:font];
   ascent_ = [font ascender];