[DirectWrite] Force subpixel font sizing to on when DW is enabled

content/renderer/renderer_main_platform_delegate_win.cc

Index: content/renderer/renderer_main_platform_delegate_win.cc
diff --git a/content/renderer/renderer_main_platform_delegate_win.cc b/content/renderer/renderer_main_platform_delegate_win.cc
index 3503fdd3ded81a4f4a5585ba6a64523147b7345f..77d5a34e159df17dcbd49b829489751918a8acb0 100644
--- a/content/renderer/renderer_main_platform_delegate_win.cc
+++ b/content/renderer/renderer_main_platform_delegate_win.cc
@@ -19,6 +19,7 @@
 #include "content/renderer/render_thread_impl.h"
 #include "sandbox/win/src/sandbox.h"
 #include "skia/ext/vector_platform_device_emf_win.h"
+#include "third_party/WebKit/public/web/WebRuntimeFeatures.h"
 #include "third_party/WebKit/public/web/win/WebFontRendering.h"
 #include "third_party/icu/source/i18n/unicode/timezone.h"
 #include "third_party/skia/include/ports/SkFontMgr.h"
@@ -103,7 +104,9 @@ void RendererMainPlatformDelegate::PlatformInitialize() {
     }
   }
   blink::WebFontRendering::setUseDirectWrite(use_direct_write);
-  blink::WebFontRendering::setUseSubpixelPositioning(use_direct_write);
+  if (use_direct_write) {
+    blink::WebRuntimeFeatures::enableSubpixelFontScaling(true);
+  }
 }
 
 void RendererMainPlatformDelegate::PlatformUninitialize() {