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..83df00b6cee1ed5499fad3cbd8d8cbe874ec6a65 100644
--- a/components/offline_pages/core/offline_page_model.h
+++ b/components/offline_pages/core/offline_page_model.h
@@ -70,6 +70,10 @@ class OfflinePageModel : public base::SupportsUserData {
 
     // The original URL of the page to save. Empty if no redirect occurs.
     GURL original_url;
+
+    // Whether to remove the popup overlay that obstructs viewing the normal
+    // content.
+    bool remove_popup_overlay;
   };
 
   // Observer of the OfflinePageModel.