Make CSSParserContext be garbage collected.

third_party/WebKit/Source/core/loader/resource/CSSStyleSheetResourceTest.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/loader/resource/CSSStyleSheetResource.h"
 
 #include "core/css/CSSCrossfadeValue.h"
 #include "core/css/CSSImageValue.h"
 #include "core/css/CSSPrimitiveValue.h"
 #include "core/css/CSSProperty.h"
@@ skipping 61 matching lines @@
   ASSERT_TRUE(imageResource);
   memoryCache()->add(imageResource);
   ASSERT_TRUE(memoryCache()->contains(imageResource));
 
   CSSStyleSheetResource* cssResource =
       CSSStyleSheetResource::createForTest(ResourceRequest(cssURL), "utf-8");
   cssResource->responseReceived(
       ResourceResponse(cssURL, "style/css", 0, nullAtom, String()), nullptr);
   cssResource->finish();
 
-  CSSParserContext parserContext(HTMLStandardMode, nullptr);
+  CSSParserContext* parserContext = new CSSParserContext(HTMLStandardMode);
   StyleSheetContents* contents = StyleSheetContents::create(parserContext);
   CSSStyleSheet* sheet = CSSStyleSheet::create(contents, document());
   EXPECT_TRUE(sheet);
 
   contents->checkLoaded();
   cssResource->saveParsedStyleSheet(contents);
 
   // Verify that the cache will have a mapping for |imageResource| at |url|.
   // The underlying |contents| for the stylesheet resource must have a
   // matching reference status.
   EXPECT_TRUE(memoryCache()->contains(imageResource));
   EXPECT_FALSE(memoryCache()->contains(cssResource));
   EXPECT_FALSE(contents->isReferencedFromResource());
   EXPECT_FALSE(cssResource->restoreParsedStyleSheet(parserContext));
 }
 
 }  // namespace
 }  // namespace blink