https://bugs.webkit.org/b/107231 - CSSParser::parseFontFamily should allow the keyword "default" as part of a font name

The next 4 lines should use the default font (same as this line):
Test 1
Test 2
Test 3
Test 4

The next 6 lines should use the font Arial:
Test 1
Test 2
Test 3
Test 4
Test 5
Test 6

The next 9 lines should use the font Ahem (black boxes):
Test 1
Test 2
Test 3
Test 4
Test 5
Test 6
Test 7
Test 8
Test 9