Detect file system errors during downloads.

content/browser/download/base_file.h

 // Copyright (c) 2011 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 CONTENT_BROWSER_DOWNLOAD_BASE_FILE_H_
 #define CONTENT_BROWSER_DOWNLOAD_BASE_FILE_H_
 #pragma once
 
 #include <string>
 
@@ skipping 54 matching lines @@
   virtual std::string DebugString() const;
 
  protected:
   bool Open();
   void Close();
 
   // Full path to the file including the file name.
   FilePath full_path_;
 
  private:
+  friend class BaseFileTest;
+
   static const size_t kSha256HashLen = 32;
 
   // Source URL for the file being downloaded.
   GURL source_url_;
 
   // The URL where the download was initiated.
   GURL referrer_url_;
 
   // OS file stream for writing
   linked_ptr<net::FileStream> file_stream_;
@@ skipping 14 matching lines @@
   unsigned char sha256_hash_[kSha256HashLen];
 
   // Indicates that this class no longer owns the associated file, and so
   // won't delete it on destruction.
   bool detached_;
 
   DISALLOW_COPY_AND_ASSIGN(BaseFile);
 };
 
 #endif  // CONTENT_BROWSER_DOWNLOAD_BASE_FILE_H_