Persist offline page info in a navigation entry if needed

content/browser/frame_host/navigation_entry_impl.h

Index: content/browser/frame_host/navigation_entry_impl.h
diff --git a/content/browser/frame_host/navigation_entry_impl.h b/content/browser/frame_host/navigation_entry_impl.h
index 4c96d55e2b7342d18cd35e31ca6ae2b681e20e3f..6251edc7b27fb91990e70fc7e16c3f507f2a0499 100644
--- a/content/browser/frame_host/navigation_entry_impl.h
+++ b/content/browser/frame_host/navigation_entry_impl.h
@@ -146,6 +146,8 @@ class CONTENT_EXPORT NavigationEntryImpl
   void SetRedirectChain(const std::vector<GURL>& redirects) override;
   const std::vector<GURL>& GetRedirectChain() const override;
   bool IsRestored() const override;
+  std::string GetExtraHeaders() const override;
+  void AddExtraHeaders(const std::string& extra_headers) override;
 
   // Creates a copy of this NavigationEntryImpl that can be modified
   // independently from the original.  Does not copy any value that would be
@@ -281,7 +283,7 @@ class CONTENT_EXPORT NavigationEntryImpl
     update_virtual_url_with_url_ = update;
   }
 
-  // Extra headers (separated by \n) to send during the request.
+  // Extra headers (separated by \r\n) to send during the request.
   void set_extra_headers(const std::string& extra_headers) {
     extra_headers_ = extra_headers;
   }