mac content shell drt: Do not disable antialiasing via NSDefaults

content/shell/webkit_test_platform_support_mac.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.
 
 #include "base/logging.h"
 #include "content/shell/webkit_test_platform_support.h"
 
 #include <AppKit/AppKit.h>
 #include <Foundation/Foundation.h>
 
 namespace content {
 
 namespace {
 
 void SetDefaultsToLayoutTestValues(void) {
   // So we can match the WebKit layout tests, we want to force a bunch of
   // preferences that control appearance to match.
   // (We want to do this as early as possible in application startup so
   // the settings are in before any higher layers could cache values.)
 
   NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
-
-  const NSInteger kMinFontSizeCGSmoothes = 4;
-  const NSInteger kNoFontSmoothing = 0;
+  // Do not set text-rendering prefs (AppleFontSmoothing,
+  // AppleAntiAliasingThreshold) here: Skia picks the right settings for this
+  // in layout test mode, see FontSkia.cpp in WebKit and
+  // SkFontHost_mac_coretext.cpp in skia.
   const NSInteger kBlueTintedAppearance = 1;
-  [defaults setInteger:kMinFontSizeCGSmoothes
-                forKey:@"AppleAntiAliasingThreshold"];
-  [defaults setInteger:kNoFontSmoothing
-                forKey:@"AppleFontSmoothing"];
   [defaults setInteger:kBlueTintedAppearance
                 forKey:@"AppleAquaColorVariant"];
   [defaults setObject:@"0.709800 0.835300 1.000000"
                forKey:@"AppleHighlightColor"];
   [defaults setObject:@"0.500000 0.500000 0.500000"
                forKey:@"AppleOtherHighlightColor"];
   [defaults setObject:[NSArray arrayWithObject:@"en"]
                forKey:@"AppleLanguages"];
 }
 
@@ skipping 39 matching lines @@
                                          kCTFontManagerScopeProcess,
                                          &errors)) {
     DLOG(FATAL) << "Fail to activate fonts.";
     CFRelease(errors);
   }
 
   return true;
 }
 
 }  // namespace