Disallow links from being seen by the extensions via the fileapi.

base/file_util_win.cc

 // 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.
 
 #include "base/file_util.h"
 
 #include <windows.h>
 #include <propvarutil.h>
 #include <psapi.h>
 #include <shellapi.h>
@@ skipping 684 matching lines @@
     } else {
       LOG(WARNING) << "Failed to create directory " << full_path_str
                    << ", last error is " << error_code << ".";
       return false;
     }
   } else {
     return true;
   }
 }
 
+// TODO(rkc): Work out if we want to handle NTFS junctions here or not, handle
+// them if we do decide to.
+bool IsLink(const FilePath& file_path) {
+  return false;
+}
+
 bool GetFileInfo(const FilePath& file_path, base::PlatformFileInfo* results) {
   base::ThreadRestrictions::AssertIOAllowed();
 
   WIN32_FILE_ATTRIBUTE_DATA attr;
   if (!GetFileAttributesEx(file_path.value().c_str(),
                            GetFileExInfoStandard, &attr)) {
     return false;
   }
 
   ULARGE_INTEGER size;
@@ skipping 447 matching lines @@
       uint8 unused = *(touch + offset);
       offset += step_size;
     }
     FreeLibrary(dll_module);
   }
 
   return true;
 }
 
 }  // namespace file_util