[Offline pages] Detecting missing offline copy

chrome/android/java/src/org/chromium/chrome/browser/enhancedbookmarks/EnhancedBookmarkItemsAdapter.java

Index: chrome/android/java/src/org/chromium/chrome/browser/enhancedbookmarks/EnhancedBookmarkItemsAdapter.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/enhancedbookmarks/EnhancedBookmarkItemsAdapter.java b/chrome/android/java/src/org/chromium/chrome/browser/enhancedbookmarks/EnhancedBookmarkItemsAdapter.java
index 88b8c500320e350fcfb602b9767c79af956dc7d4..b98bad3c73e365a6b11e0230d54b346a3e81e12c 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/enhancedbookmarks/EnhancedBookmarkItemsAdapter.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/enhancedbookmarks/EnhancedBookmarkItemsAdapter.java
@@ -280,6 +280,16 @@ class EnhancedBookmarkItemsAdapter extends RecyclerView.Adapter<RecyclerView.Vie
                 public void offlinePageModelChanged() {
                     mDelegate.notifyStateChange(EnhancedBookmarkItemsAdapter.this);
                 }
+
+                @Override
+                public void offlinePageDeleted(BookmarkId bookmarkId) {
+                    if (mDelegate.getCurrentState() == UIState.STATE_FILTER) {
+                        int deletedPosition = getPositionForBookmark(bookmarkId);
+                        if (deletedPosition >= 0) {
+                            removeItem(deletedPosition);
+                        }
+                    }
+                }
             };
             offlinePageBridge.addObserver(mOfflinePageModelObserver);
 
@@ -329,6 +339,7 @@ class EnhancedBookmarkItemsAdapter extends RecyclerView.Adapter<RecyclerView.Vie
     public void onFilterStateSet(EnhancedBookmarkFilter filter) {
         assert filter == EnhancedBookmarkFilter.OFFLINE_PAGES;
         setBookmarks(null, mDelegate.getModel().getBookmarkIDsByFilter(filter));
+        mDelegate.getModel().getOfflinePageBridge().checkOfflinePageMetadata();
     }
 
     @Override