Check File snapshots and Blob byte counts when writing to IDB

content/browser/indexed_db/indexed_db_active_blob_registry.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/stl_util.h"
 #include "base/task_runner.h"
 #include "content/browser/indexed_db/indexed_db_active_blob_registry.h"
 #include "content/browser/indexed_db/indexed_db_backing_store.h"
 #include "content/browser/indexed_db/indexed_db_factory.h"
 #include "content/browser/indexed_db/indexed_db_leveldb_coding.h"
 
 namespace content {
 
 IndexedDBActiveBlobRegistry::IndexedDBActiveBlobRegistry(
     IndexedDBBackingStore* backing_store)
     : backing_store_(backing_store), weak_factory_(this) {}
 
 IndexedDBActiveBlobRegistry::~IndexedDBActiveBlobRegistry() {
-  DCHECK(use_tracker_.empty());
 }
 
 void IndexedDBActiveBlobRegistry::AddBlobRef(int64 database_id,
                                              int64 blob_key) {
   DCHECK(backing_store_);
   DCHECK(backing_store_->task_runner()->RunsTasksOnCurrentThread());
   DCHECK(KeyPrefix::IsValidDatabaseId(database_id));
   DCHECK(DatabaseMetaDataKey::IsValidBlobKey(blob_key));
   DCHECK(!ContainsKey(deleted_dbs_, database_id));
   bool need_ref = use_tracker_.empty();
@@ skipping 107 matching lines @@
                     blob_key);
 }
 
 void IndexedDBActiveBlobRegistry::ForceShutdown() {
   weak_factory_.InvalidateWeakPtrs();
   use_tracker_.clear();
   backing_store_ = NULL;
 }
 
 }  // namespace content