Remove failing DCHECKs in Blob code.

webkit/browser/blob/blob_storage_context.cc

 // Copyright (c) 2013 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/browser/blob/blob_storage_context.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop_proxy.h"
@@ skipping 125 matching lines @@
   // list of Data, File, and FileSystem items. Aggregated TYPE_BLOB items
   // are expanded into the primitive constituent types.
   // 1) The Data item is denoted by the raw data and length.
   // 2) The File item is denoted by the file path, the range and the expected
   //    modification time.
   // 3) The FileSystem File item is denoted by the FileSystem URL, the range
   //    and the expected modification time.
   // 4) The Blob items are expanded.
   // TODO(michaeln): Would be nice to avoid copying Data items when expanding.
 
-  DCHECK(item.length() > 0);
   switch (item.type()) {
     case BlobData::Item::TYPE_BYTES:
       DCHECK(!item.offset());
       exceeded_memory = !AppendBytesItem(target_blob_data,
                                          item.bytes(),
                                          static_cast<int64>(item.length()));
       break;
     case BlobData::Item::TYPE_FILE:
       AppendFileItem(target_blob_data,
                      item.path(),
@@ skipping 159 matching lines @@
   if (found == blob_map_.end())
     return false;
   return found->second.flags & BEING_BUILT;
 }
 
 bool BlobStorageContext::IsUrlRegistered(const GURL& blob_url) {
   return public_blob_urls_.find(blob_url) != public_blob_urls_.end();
 }
 
 }  // namespace webkit_blob