Make PMingLiu-ExtB the same minAntiAliasSizeForFont settings as PMingLiu

This patch make "pmingliu-extb" font family to have the same
minAntiAliasSizeForFont settings as "pmingliu". These two fonts are the
same family except the code point coverage, and thus should have the
same rendering characteristics.

BUG=575094

Review URL: https://codereview.chromium.org/1711623002

Cr-Commit-Position: refs/heads/master@{#376139}

third_party/WebKit/Source/platform/fonts/win/FontCacheSkiaWin.cpp

@@ -382,7 +382,8 @@ PassOwnPtr<FontPlatformData> FontCache::createFontPlatformData(const FontDescrip
         { L"simsun", 11 },
         { L"dotum", 12 },
         { L"gulim", 12 },
-        { L"pmingliu", 11 }
+        { L"pmingliu", 11 },
+        { L"pmingliu-extb", 11 }
     };
     size_t numFonts = WTF_ARRAY_LENGTH(minAntiAliasSizeForFont);
     for (size_t i = 0; i < numFonts; i++) {