Revert 239280 "Move more file_util functions to base namespace."

trunk/src/chrome/browser/chromeos/drive/file_cache.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 "chrome/browser/chromeos/drive/file_cache.h"
 
 #include <vector>
 
 #include "base/file_util.h"
 #include "base/files/file_enumerator.h"
@@ skipping 411 matching lines @@
       if (!it->second.is_dirty &&
           it->second.md5 == util::GetMd5Digest(current)) {
         base::DeleteFile(current, false /* recursive */);
         continue;
       }
     }
 
     // Read file contents to sniff mime type.
     std::vector<char> content(net::kMaxBytesToSniff);
     const int read_result =
-        base::ReadFile(current, &content[0], content.size());
+        file_util::ReadFile(current, &content[0], content.size());
     if (read_result < 0) {
       LOG(WARNING) << "Cannot read: " << current.value();
       return false;
     }
     if (read_result == 0)  // Skip empty files.
       continue;
 
     // Use recovered file name if available, otherwise decide file name with
     // sniffed mime type.
     base::FilePath dest_base_name(FILE_PATH_LITERAL("file"));
@@ skipping 143 matching lines @@
     const std::string& id = GetIdFromPath(new_path);
     new_path = GetCacheFilePath(util::CanonicalizeResourceId(id));
     if (new_path != current && !base::Move(current, new_path))
       return false;
   }
   return true;
 }
 
 }  // namespace internal
 }  // namespace drive