Revert 138554 - Prevent zero-length items from being appended to a blob.

webkit/blob/blob_storage_controller.cc

 // Copyright (c) 2012 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 "webkit/blob/blob_storage_controller.h"
 
 #include "base/logging.h"
 #include "googleurl/src/gurl.h"
 #include "net/base/upload_data.h"
 #include "webkit/blob/blob_data.h"
@@ skipping 50 matching lines @@
   memory_usage_ -= target_blob_data->GetMemoryUsage();
 
   // The blob data is stored in the "canonical" way. That is, it only contains a
   // list of Data and File items.
   // 1) The Data item is denoted by the raw data and the range.
   // 2) The File item is denoted by the file path, the range and the expected
   //    modification time.
   // All the Blob items in the passing blob data are resolved and expanded into
   // a set of Data and File items.
 
-  DCHECK(item.length > 0);
   switch (item.type) {
     case BlobData::TYPE_DATA:
       // WebBlobData does not allow partial data.
       DCHECK(!(item.offset) && item.length == item.data.size());
       target_blob_data->AppendData(item.data.c_str(), item.data.size());
       break;
     case BlobData::TYPE_DATA_EXTERNAL:
       DCHECK(!item.offset);
       target_blob_data->AppendData(item.data_external, item.length);
       break;
@@ skipping 211 matching lines @@
 bool BlobStorageController::DecrementBlobDataUsage(BlobData* blob_data) {
   BlobDataUsageMap::iterator found = blob_data_usage_count_.find(blob_data);
   DCHECK(found != blob_data_usage_count_.end());
   if (--(found->second))
     return false;  // Still in use
   blob_data_usage_count_.erase(found);
   return true;
 }
 
 }  // namespace webkit_blob