IndexedDB: Fix cursor prefetching edge cases

content/child/indexed_db/webidbcursor_impl.cc

Index: content/child/indexed_db/webidbcursor_impl.cc
diff --git a/content/child/indexed_db/webidbcursor_impl.cc b/content/child/indexed_db/webidbcursor_impl.cc
index 36426352a0705396bb6068fd83b1a8fd9a1a7298..50f7ebf0409b640cb0732d79064fefc5dfb09063 100644
--- a/content/child/indexed_db/webidbcursor_impl.cc
+++ b/content/child/indexed_db/webidbcursor_impl.cc
@@ -161,6 +161,14 @@ void WebIDBCursorImpl::CachedContinue(WebIDBCallbacks* callbacks) {
 
   ++pending_onsuccess_callbacks_;
 
+  if (!continue_count_) {
+    // The cache was invalidated by a call to ResetPrefetchCache()
+    // after the RequestIDBCursorPrefetch() was made. Now that the
+    // initiating continue() call has been satisfied, discard
+    // the rest of the cache.
+    ResetPrefetchCache();
+  }
+
   callbacks->onSuccess(WebIDBKeyBuilder::Build(key),
                        WebIDBKeyBuilder::Build(primary_key),
                        value);