Add a few more edge cases to CSS serialization test.

third_party/WebKit/Source/core/frame/FrameSerializer.cpp

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 393 matching lines @@
     case CSSRule::kStyleRule:
       retrieveResourcesForProperties(
           &toCSSStyleRule(rule)->styleRule()->properties(), document);
       break;
 
     case CSSRule::kImportRule: {
       CSSImportRule* importRule = toCSSImportRule(rule);
       KURL sheetBaseURL = rule->parentStyleSheet()->baseURL();
       ASSERT(sheetBaseURL.isValid());
       KURL importURL = KURL(sheetBaseURL, importRule->href());
-      if (m_resourceURLs.contains(importURL))
-        break;
       if (importRule->styleSheet())
         serializeCSSStyleSheet(*importRule->styleSheet(), importURL);
       break;
     }
 
     // Rules inheriting CSSGroupingRule
     case CSSRule::kMediaRule:
     case CSSRule::kSupportsRule: {
       CSSRuleList* ruleList = rule->cssRules();
       for (unsigned i = 0; i < ruleList->length(); ++i)
@@ skipping 133 matching lines @@
     emitsMinus = ch == '-';
     builder.append(ch);
   }
   CString escapedUrl = builder.toString().ascii();
   return String::format("saved from url=(%04d)%s",
                         static_cast<int>(escapedUrl.length()),
                         escapedUrl.data());
 }
 
 }  // namespace blink