Gardening: Fix tests failing on Win7(dbg) caused by hitting an assert in...

Gardening: Fix tests failing on Win7(dbg) caused by hitting an assert in FontCache::addSideloadedFontForTesting

NOTRY=true
TBR=arv@chromium.org,tkent@chromium.org
BUG=None

Review URL: https://codereview.chromium.org/549013002

git-svn-id: svn://svn.chromium.org/blink/trunk@181532 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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

@@ -48,6 +48,8 @@ HashMap<String, RefPtr<SkTypeface> >* FontCache::s_sideloadedFonts = 0;
 // static
 void FontCache::addSideloadedFontForTesting(SkTypeface* typeface)
 {
+    if (!typeface)
+        return;
     if (!s_sideloadedFonts)
         s_sideloadedFonts = new HashMap<String, RefPtr<SkTypeface> >;
     SkString name;