(Re-)introduce AncestorThrottle to handle 'X-Frame-Options'.

third_party/WebKit/Source/core/loader/DocumentLoader.h

Index: third_party/WebKit/Source/core/loader/DocumentLoader.h
diff --git a/third_party/WebKit/Source/core/loader/DocumentLoader.h b/third_party/WebKit/Source/core/loader/DocumentLoader.h
index 48a9a34a1ffdac665fd74848e86b7320a6f81ae5..515143c894933b9b330ea7a0924d6a1b1253d3a0 100644
--- a/third_party/WebKit/Source/core/loader/DocumentLoader.h
+++ b/third_party/WebKit/Source/core/loader/DocumentLoader.h
@@ -145,8 +145,8 @@ public:
     };
     InitialScrollState& initialScrollState() { return m_initialScrollState; }
 
-    void setWasBlockedAfterXFrameOptionsOrCSP() { m_wasBlockedAfterXFrameOptionsOrCSP = true; }
-    bool wasBlockedAfterXFrameOptionsOrCSP() { return m_wasBlockedAfterXFrameOptionsOrCSP; }
+    void setWasBlockedAfterCSP() { m_wasBlockedAfterCSP = true; }
+    bool wasBlockedAfterCSP() { return m_wasBlockedAfterCSP; }
 
     void dispatchLinkHeaderPreloads(ViewportDescriptionWrapper*, LinkLoader::MediaPreloadPolicy);
 
@@ -176,7 +176,7 @@ private:
     bool maybeCreateArchive();
 
     void finishedLoading(double finishTime);
-    void cancelLoadAfterXFrameOptionsOrCSPDenied(const ResourceResponse&);
+    void cancelLoadAfterCSPDenied(const ResourceResponse&);
     void redirectReceived(Resource*, ResourceRequest&, const ResourceResponse&) final;
     void responseReceived(Resource*, const ResourceResponse&, std::unique_ptr<WebDataConsumerHandle>) final;
     void dataReceived(Resource*, const char* data, size_t length) final;
@@ -228,7 +228,7 @@ private:
     ClientHintsPreferences m_clientHintsPreferences;
     InitialScrollState m_initialScrollState;
 
-    bool m_wasBlockedAfterXFrameOptionsOrCSP;
+    bool m_wasBlockedAfterCSP;
 
     enum State {
         NotStarted,