Revert of [Blob] BlobReader class & tests, and removal of all redundant reading.

storage/browser/blob/blob_data_snapshot.h

 // Copyright 2015 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.
 
 #ifndef STORAGE_BROWSER_BLOB_BLOB_DATA_SNAPSHOT_H_
 #define STORAGE_BROWSER_BLOB_BLOB_DATA_SNAPSHOT_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 35 matching lines @@
                    const std::string& content_type,
                    const std::string& content_disposition);
   BlobDataSnapshot(const std::string& uuid,
                    const std::string& content_type,
                    const std::string& content_disposition,
                    const std::vector<scoped_refptr<BlobDataItem>>& items);
 
   const std::string uuid_;
   const std::string content_type_;
   const std::string content_disposition_;
-
   // Non-const for constrution in BlobStorageContext
   std::vector<scoped_refptr<BlobDataItem>> items_;
 };
 
 }  // namespace storage
 #endif  // STORAGE_BROWSER_BLOB_BLOB_DATA_SNAPSHOT_H_