Move ownership of source SiteInstance to the FrameNavigationEntry.

content/browser/frame_host/frame_navigation_entry.cc

Index: content/browser/frame_host/frame_navigation_entry.cc
diff --git a/content/browser/frame_host/frame_navigation_entry.cc b/content/browser/frame_host/frame_navigation_entry.cc
index 90293581b502af741c82d0e2aa98f27621b7caf9..c400083878cc58b00f4721429237a5f4926fad16 100644
--- a/content/browser/frame_host/frame_navigation_entry.cc
+++ b/content/browser/frame_host/frame_navigation_entry.cc
@@ -35,14 +35,16 @@ FrameNavigationEntry::~FrameNavigationEntry() {
 FrameNavigationEntry* FrameNavigationEntry::Clone() const {
   FrameNavigationEntry* copy = new FrameNavigationEntry();
   copy->UpdateEntry(frame_unique_name_, item_sequence_number_,
-                    document_sequence_number_, site_instance_.get(), url_,
-                    referrer_, page_state_, method_, post_id_);
+                    document_sequence_number_, source_site_instance_.get(),
+                    site_instance_.get(), url_, referrer_, page_state_, method_,
+                    post_id_);
   return copy;
 }
 
 void FrameNavigationEntry::UpdateEntry(const std::string& frame_unique_name,
                                        int64_t item_sequence_number,
                                        int64_t document_sequence_number,
+                                       SiteInstanceImpl* source_site_instance,
                                        SiteInstanceImpl* site_instance,
                                        const GURL& url,
                                        const Referrer& referrer,
@@ -52,6 +54,7 @@ void FrameNavigationEntry::UpdateEntry(const std::string& frame_unique_name,
   frame_unique_name_ = frame_unique_name;
   item_sequence_number_ = item_sequence_number;
   document_sequence_number_ = document_sequence_number;
+  source_site_instance_ = source_site_instance;
   site_instance_ = site_instance;
   url_ = url;
   referrer_ = referrer;