Revert of Teach HistoryItem about a request's initiator.

third_party/WebKit/Source/core/loader/HistoryItem.cpp

Index: third_party/WebKit/Source/core/loader/HistoryItem.cpp
diff --git a/third_party/WebKit/Source/core/loader/HistoryItem.cpp b/third_party/WebKit/Source/core/loader/HistoryItem.cpp
index b382b7909dedde24584c30f61227e6f0260ded1f..373ed46f31a0e047f9b78f44df8c72864ff492a3 100644
--- a/third_party/WebKit/Source/core/loader/HistoryItem.cpp
+++ b/third_party/WebKit/Source/core/loader/HistoryItem.cpp
@@ -28,7 +28,6 @@
 #include "core/dom/Document.h"
 #include "core/html/forms/FormController.h"
 #include "platform/network/ResourceRequest.h"
-#include "platform/weborigin/SecurityOrigin.h"
 #include "platform/weborigin/SecurityPolicy.h"
 #include "wtf/Assertions.h"
 #include "wtf/CurrentTime.h"
@@ -76,11 +75,6 @@
     return m_target;
 }
 
-PassRefPtr<SecurityOrigin> HistoryItem::requestorOrigin() const
-{
-    return SecurityOrigin::createFromString(m_requestorOrigin);
-}
-
 void HistoryItem::setURLString(const String& urlString)
 {
     if (m_urlString != urlString)
@@ -96,11 +90,6 @@
 {
     // This should be a RELEASE_ASSERT.
     m_referrer = SecurityPolicy::generateReferrer(referrer.referrerPolicy, url(), referrer.referrer);
-}
-
-void HistoryItem::setRequestorOrigin(PassRefPtr<SecurityOrigin> origin)
-{
-    m_requestorOrigin = origin->toString();
 }
 
 void HistoryItem::setTarget(const String& target)