[test] lazily parse css style rules

third_party/WebKit/Source/core/css/StyleSheetContents.cpp

Index: third_party/WebKit/Source/core/css/StyleSheetContents.cpp
diff --git a/third_party/WebKit/Source/core/css/StyleSheetContents.cpp b/third_party/WebKit/Source/core/css/StyleSheetContents.cpp
index 9ad890082c3cc4b20fc52366b5317ba5fd16ad06..6a11c7fe0e7ad9ad138dafbf598e5ed37acb30d4 100644
--- a/third_party/WebKit/Source/core/css/StyleSheetContents.cpp
+++ b/third_party/WebKit/Source/core/css/StyleSheetContents.cpp
@@ -341,8 +341,7 @@ void StyleSheetContents::parseAuthorStyleSheet(const CSSStyleSheetResource* cach
         m_sourceMapURL = response.httpHeaderField(HTTPNames::X_SourceMap);
     }
 
-    CSSParserContext context(parserContext(), UseCounter::getFrom(this));
-    CSSParser::parseSheet(context, this, sheetText);
+    CSSParser::parseSheet(parserContext(), this, sheetText);
 }
 
 void StyleSheetContents::parseString(const String& sheetText)
@@ -352,8 +351,7 @@ void StyleSheetContents::parseString(const String& sheetText)
 
 void StyleSheetContents::parseStringAtPosition(const String& sheetText, const TextPosition& startPosition)
 {
-    CSSParserContext context(parserContext(), UseCounter::getFrom(this));
-    CSSParser::parseSheet(context, this, sheetText);
+    CSSParser::parseSheet(parserContext(), this, sheetText);
 }
 
 bool StyleSheetContents::isLoading() const