Never fire popstate event when navigating between documents

Source/core/loader/FrameLoader.cpp

Index: Source/core/loader/FrameLoader.cpp
diff --git a/Source/core/loader/FrameLoader.cpp b/Source/core/loader/FrameLoader.cpp
index e01198cdeb4ee1616956d3a34c0929078e904a76..640d69af701d16bc320672cf21b3a4f62ee28c19 100644
--- a/Source/core/loader/FrameLoader.cpp
+++ b/Source/core/loader/FrameLoader.cpp
@@ -374,9 +374,6 @@ void FrameLoader::didBeginDocument(bool dispatch)
 {
     m_frame->document()->setReadyState(Document::Loading);
 
-    if (m_provisionalItem && (m_loadType == FrameLoadTypeBackForward || m_loadType == FrameLoadTypeInitialHistoryLoad))
-        m_frame->domWindow()->statePopped(m_provisionalItem->stateObject());
-
     if (dispatch)
         dispatchDidClearDocumentOfWindowObject();