Make CSSParserContext be garbage collected.

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

Index: third_party/WebKit/Source/core/css/StyleSheetContents.h
diff --git a/third_party/WebKit/Source/core/css/StyleSheetContents.h b/third_party/WebKit/Source/core/css/StyleSheetContents.h
index b54a61b041ac3824a49ad12a0f697a4a275b12ad..caf0fcb28a32368f69150e5c66a70162f097e908 100644
--- a/third_party/WebKit/Source/core/css/StyleSheetContents.h
+++ b/third_party/WebKit/Source/core/css/StyleSheetContents.h
@@ -48,22 +48,22 @@ class StyleRuleNamespace;
 class CORE_EXPORT StyleSheetContents
     : public GarbageCollectedFinalized<StyleSheetContents> {
  public:
-  static StyleSheetContents* create(const CSSParserContext& context) {
+  static StyleSheetContents* create(const CSSParserContext* context) {
     return new StyleSheetContents(0, String(), context);
   }
   static StyleSheetContents* create(const String& originalURL,
-                                    const CSSParserContext& context) {
+                                    const CSSParserContext* context) {
     return new StyleSheetContents(0, originalURL, context);
   }
   static StyleSheetContents* create(StyleRuleImport* ownerRule,
                                     const String& originalURL,
-                                    const CSSParserContext& context) {
+                                    const CSSParserContext* context) {
     return new StyleSheetContents(ownerRule, originalURL, context);
   }
 
   ~StyleSheetContents();
 
-  const CSSParserContext& parserContext() const { return m_parserContext; }
+  const CSSParserContext* parserContext() const { return m_parserContext; }
 
   const AtomicString& defaultNamespace() { return m_defaultNamespace; }
   const AtomicString& namespaceURIFromPrefix(const AtomicString& prefix);
@@ -91,7 +91,7 @@ class CORE_EXPORT StyleSheetContents
   // if there are none.
   Document* anyOwnerDocument() const;
 
-  const String& charset() const { return m_parserContext.charset(); }
+  const String& charset() const { return m_parserContext->charset(); }
 
   bool loadCompleted() const;
   bool hasFailedOrCanceledSubresources() const;
@@ -135,7 +135,7 @@ class CORE_EXPORT StyleSheetContents
   // this style sheet. This property probably isn't useful for much except
   // the JavaScript binding (which needs to use this value for security).
   String originalURL() const { return m_originalURL; }
-  const KURL& baseURL() const { return m_parserContext.baseURL(); }
+  const KURL& baseURL() const { return m_parserContext->baseURL(); }
 
   unsigned ruleCount() const;
   StyleRuleBase* ruleAt(unsigned index) const;
@@ -185,7 +185,7 @@ class CORE_EXPORT StyleSheetContents
  private:
   StyleSheetContents(StyleRuleImport* ownerRule,
                      const String& originalURL,
-                     const CSSParserContext&);
+                     const CSSParserContext*);
   StyleSheetContents(const StyleSheetContents&);
   StyleSheetContents() = delete;
   StyleSheetContents& operator=(const StyleSheetContents&) = delete;
@@ -215,7 +215,7 @@ class CORE_EXPORT StyleSheetContents
   bool m_hasSingleOwnerDocument : 1;
   bool m_isUsedFromTextCache : 1;
 
-  CSSParserContext m_parserContext;
+  Member<const CSSParserContext> m_parserContext;
 
   HeapHashSet<WeakMember<CSSStyleSheet>> m_loadingClients;
   HeapHashSet<WeakMember<CSSStyleSheet>> m_completedClients;