Wipe out offline page data on clearing cookie and site data

components/offline_pages/offline_page_metadata_store.h

Index: components/offline_pages/offline_page_metadata_store.h
diff --git a/components/offline_pages/offline_page_metadata_store.h b/components/offline_pages/offline_page_metadata_store.h
index d50159f79e19e073a5b2a784653a696d9a1b2d73..d9f641e1780bb02b83bc5532af0d3f0a0895c461 100644
--- a/components/offline_pages/offline_page_metadata_store.h
+++ b/components/offline_pages/offline_page_metadata_store.h
@@ -25,6 +25,7 @@ class OfflinePageMetadataStore {
   typedef base::Callback<void(bool, const std::vector<OfflinePageItem>&)>
       LoadCallback;
   typedef base::Callback<void(bool)> UpdateCallback;
+  typedef base::Callback<void(bool)> ResetCallback;
 
   OfflinePageMetadataStore();
   virtual ~OfflinePageMetadataStore();
@@ -41,6 +42,9 @@ class OfflinePageMetadataStore {
   // Result of the update is passed in callback.
   virtual void RemoveOfflinePages(const std::vector<int64>& bookmark_ids,
                                   const UpdateCallback& callback) = 0;
+
+  // Resets the store.
+  virtual void Reset(const ResetCallback& callback) = 0;
 };
 
 }  // namespace offline_pages