Remove !typeFace early return in fontFamilyName

This early return was protecting against SVG Font usage, however SVG
Fonts were removed in https://codereview.chromium.org/656913006, so
convert into an ASSERT instead and remove the outdated comment.

Review URL: https://codereview.chromium.org/684463004

git-svn-id: svn://svn.chromium.org/blink/trunk@184804 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/platform/fonts/FontPlatformData.cpp

@@ -315,9 +315,7 @@ SkFontID FontPlatformData::uniqueID() const
 
 String FontPlatformData::fontFamilyName() const
 {
-    // FIXME(crbug.com/326582): come up with a proper way of handling SVG.
-    if (!this->typeface())
-        return "";
+    ASSERT(this->typeface());
     SkTypeface::LocalizedStrings* fontFamilyIterator = this->typeface()->createFamilyNameIterator();
     SkTypeface::LocalizedString localizedString;
     while (fontFamilyIterator->next(&localizedString) && !localizedString.fString.size()) { }