Implement DownloadFile::Rename() for posix. Downloads work on linux!

base/file_util_posix.cc

 // Copyright (c) 2006-2008 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/file_util.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <fnmatch.h>
 #include <fts.h>
@@ skipping 89 matching lines @@
           break;
       }
       fts_ent = fts_read(fts);
     }
     fts_close(fts);
   }
   return success;
 }
 
 bool Move(const FilePath& from_path, const FilePath& to_path) {
-  return (rename(from_path.value().c_str(),
-                 to_path.value().c_str()) == 0);
+  if (rename(from_path.value().c_str(), to_path.value().c_str()) == 0)
+    return true;
+
+  if (!CopyDirectory(from_path, to_path, true))
+    return false;
+
+  Delete(from_path, true);
+  return true;
 }
 
 bool CopyDirectory(const FilePath& from_path,
                    const FilePath& to_path,
                    bool recursive) {
   // Some old callers of CopyDirectory want it to support wildcards.
   // After some discussion, we decided to fix those callers.
   // Break loudly here if anyone tries to do this.
   // TODO(evanm): remove this once we're sure it's ok.
   DCHECK(to_path.value().find('*') == std::string::npos);
@@ skipping 452 matching lines @@
     munmap(data_, length_);
   if (file_ != -1)
     close(file_);
 
   data_ = NULL;
   length_ = 0;
   file_ = -1;
 }
 
 } // namespace file_util