[Offline Pages] Don't remove user-requested pages when deleting cache.

components/offline_pages/offline_page_model.h

Index: components/offline_pages/offline_page_model.h
diff --git a/components/offline_pages/offline_page_model.h b/components/offline_pages/offline_page_model.h
index 72f9d41778e11e2739c09ee320dc480b49a6a854..59034dac60fbd09b760a2d319aee0f7ce6ac8981 100644
--- a/components/offline_pages/offline_page_model.h
+++ b/components/offline_pages/offline_page_model.h
@@ -103,8 +103,8 @@ class OfflinePageModel : public base::SupportsUserData {
   virtual void DeletePagesByOfflineId(const std::vector<int64_t>& offline_ids,
                                       const DeletePageCallback& callback) = 0;
 
-  // Deletes offline pages matching the URL predicate.
-  virtual void DeletePagesByURLPredicate(
+  // Deletes cached offline pages matching the URL predicate.
+  virtual void DeleteCachedPagesByURLPredicate(
       const UrlPredicate& predicate,
       const DeletePageCallback& callback) = 0;