Remove popup overlay from MHTML when requested

components/offline_pages/core/offline_page_model.h

Index: components/offline_pages/core/offline_page_model.h
diff --git a/components/offline_pages/core/offline_page_model.h b/components/offline_pages/core/offline_page_model.h
index 584d81a9566c1e73eea61ba90600c5b4a2c8864b..4376724258031683d1ef6e15f0c12dcf423aad15 100644
--- a/components/offline_pages/core/offline_page_model.h
+++ b/components/offline_pages/core/offline_page_model.h
@@ -70,6 +70,9 @@ class OfflinePageModel : public base::SupportsUserData {
 
     // The original URL of the page to save. Empty if no redirect occurs.
     GURL original_url;
+
+    // Whether the page is being saved on the background.

[fgorski, 2017/01/20 17:16:53]

nit: s/on/in/

+    bool is_background;
   };
 
   // Observer of the OfflinePageModel.