Remove a pointless use of SkWeakRefCnt.

src/ports/SkFontMgr_win_dw.cpp

Index: src/ports/SkFontMgr_win_dw.cpp
diff --git a/src/ports/SkFontMgr_win_dw.cpp b/src/ports/SkFontMgr_win_dw.cpp
index e9d494f51477cb892984222085935742da845cdd..f5bf85d3ae2efc5df52b0b71406ff3133ea6c7e6 100644
--- a/src/ports/SkFontMgr_win_dw.cpp
+++ b/src/ports/SkFontMgr_win_dw.cpp
@@ -435,7 +435,7 @@ SkTypeface* SkFontMgr_DirectWrite::createTypefaceFromDWriteFont(
     if (NULL == face) {
         face = DWriteFontTypeface::Create(fFactory.get(), fontFace, font, fontFamily);
         if (face) {
-            fTFCache.add(face, get_style(font), true);
+            fTFCache.add(face, get_style(font));
         }
     }
     return face;