CSP: Move policy parsing out of Document.

Source/core/dom/Document.h

Index: Source/core/dom/Document.h
diff --git a/Source/core/dom/Document.h b/Source/core/dom/Document.h
index 8c3a67d122a41aa0c615b09aca4b48cb0889b413..24dd90248d42dc23e572acedecdbeda6ba8b77ab 100644
--- a/Source/core/dom/Document.h
+++ b/Source/core/dom/Document.h
@@ -71,7 +71,6 @@ class CanvasRenderingContext2D;
 class Chrome;
 class Comment;
 class ConsoleMessage;
-class ContentSecurityPolicyResponseHeaders;
 class ContextFeatures;
 class CustomElementMicrotaskRunQueue;
 class CustomElementRegistrationContext;
@@ -881,7 +880,7 @@ public:
 
     void initSecurityContext();
     void initSecurityContext(const DocumentInit&);
-    void initContentSecurityPolicy(const ContentSecurityPolicyResponseHeaders&);
+    void initContentSecurityPolicy(PassRefPtr<ContentSecurityPolicy> = nullptr);
 
     bool allowInlineEventHandlers(Node*, EventListener*, const String& contextURL, const WTF::OrdinalNumber& contextLine);
     bool allowExecutingScripts(Node*);