[Offline Pages] Duplicate pages when save/delete bookmarks.

components/offline_pages/offline_page_model.cc

Index: components/offline_pages/offline_page_model.cc
diff --git a/components/offline_pages/offline_page_model.cc b/components/offline_pages/offline_page_model.cc
index cd0a93705f20b8ed1807c2f807e2a1641a37f4f7..cf03e23c7276a801bc32276fa05ded482d170dde 100644
--- a/components/offline_pages/offline_page_model.cc
+++ b/components/offline_pages/offline_page_model.cc
@@ -4,6 +4,7 @@
 
 #include "components/offline_pages/offline_page_model.h"
 
+#include "components/offline_pages/client_namespace_constants.h"
 #include "url/gurl.h"
 
 namespace offline_pages {
@@ -13,6 +14,10 @@ bool OfflinePageModel::CanSaveURL(const GURL& url) {
   return url.is_valid() && url.SchemeIsHTTPOrHTTPS();
 }
 
+bool OfflinePageModel::IsUserInitiated(const ClientId& client_id) {
+  return client_id.name_space == kBookmarkNamespace;
+}
+
 OfflinePageModel::OfflinePageModel() {}
 
 OfflinePageModel::~OfflinePageModel() {}