fontSelector should be reset when removing stylesheets which has @font-face rule.

Source/core/css/CSSParser-in.cpp

 /*
  * Copyright (C) 2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Nicholas Shanks <webkit@nickshanks.com>
  * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved.
  * Copyright (C) 2012 Intel Corporation. All rights reserved.
  *
@@ skipping 11226 matching lines @@
             endRuleBody(true);
             return 0;
         }
     }
     RefPtr<StyleRuleFontFace> rule = StyleRuleFontFace::create();
     rule->setProperties(createStylePropertySet());
     clearProperties();
     StyleRuleFontFace* result = rule.get();
     m_parsedRules.append(rule.release());
     endRuleBody();
+    if (m_styleSheet)
+        m_styleSheet->setHasFontFaceRule(true);
     return result;
 }
 
 StyleRuleBase* CSSParser::createHostRule(RuleList* rules)
 {
     m_allowImportRules = m_allowNamespaceDeclarations = false;
     RefPtr<StyleRuleHost> rule;
     if (rules)
         rule = StyleRuleHost::create(*rules);
     else {
@@ skipping 661 matching lines @@
 {
     // The tokenizer checks for the construct of an+b.
     // However, since the {ident} rule precedes the {nth} rule, some of those
     // tokens are identified as string literal. Furthermore we need to accept
     // "odd" and "even" which does not match to an+b.
     return equalIgnoringCase(token, "odd") || equalIgnoringCase(token, "even")
         || equalIgnoringCase(token, "n") || equalIgnoringCase(token, "-n");
 }
 
 }