[Offline Pages] Adding support for removed-on-cache-reset pages to query.

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 434687e9e11ee63b6ed38501fd5e63a0d42a4b5f..41b4ff8f6d71460467ba9a6103e2ade9497ef581 100644
--- a/components/offline_pages/core/offline_page_model.h
+++ b/components/offline_pages/core/offline_page_model.h
@@ -131,6 +131,12 @@ class OfflinePageModel : public base::SupportsUserData {
   virtual void DeletePagesByClientIds(const std::vector<ClientId>& client_ids,
                                       const DeletePageCallback& callback) = 0;
 
+  // Deletes all pages matching |query|.
+  virtual void DeletePagesMatchingQuery(

[dewittj, 2017/05/03 21:55:09]

I wonder if we shouldn't make it so easy :) and make clients use a query
followed by DeletePagesByOfflineId. WDYT

[romax, 2017/05/03 23:23:08]

Can't agree more! I've removed this method since the only potentially current
client will be removed as well :)

+      std::unique_ptr<OfflinePageModelQuery> query,
+      const DeletePageCallback& callback) = 0;
+
+  // Retrieves all pages matching |query|.
   virtual void GetPagesMatchingQuery(
       std::unique_ptr<OfflinePageModelQuery> query,
       const MultipleOfflinePageItemCallback& callback) = 0;