Make CSSParserContext be garbage collected.

third_party/WebKit/Source/core/html/LinkStyle.cpp

Index: third_party/WebKit/Source/core/html/LinkStyle.cpp
diff --git a/third_party/WebKit/Source/core/html/LinkStyle.cpp b/third_party/WebKit/Source/core/html/LinkStyle.cpp
index d69eb9f7cb775fdd3726852df81df07344a031e7..96551688b04ad5b974750cf5c4b388bd66bcdffa 100644
--- a/third_party/WebKit/Source/core/html/LinkStyle.cpp
+++ b/third_party/WebKit/Source/core/html/LinkStyle.cpp
@@ -107,8 +107,8 @@ void LinkStyle::setCSSStyleSheet(
     }
   }
 
-  CSSParserContext parserContext(m_owner->document(), nullptr, baseURL,
-                                 charset);
+  CSSParserContext* parserContext =
+      new CSSParserContext(m_owner->document(), baseURL, charset);
 
   DEFINE_STATIC_LOCAL(EnumerationHistogram, restoredCachedStyleSheetHistogram,
                       ("Blink.RestoredCachedStyleSheet", 2));