Use ExtractDrivePath(path()) instead of virtual_path() for getting Drive path.

chrome/browser/chromeos/drive/drive_file_system_util.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/drive_file_system_util.h"
 
 #include <string>
 #include <utility>
 #include <vector>
 
@@ skipping 260 matching lines @@
 
   // -1 to include 'drive'.
   base::FilePath extracted;
   for (size_t i = arraysize(kDriveMountPointPathComponents) - 1;
        i < components.size(); ++i) {
     extracted = extracted.Append(components[i]);
   }
   return extracted;
 }
 
+base::FilePath ExtractDrivePathFromFileSystemUrl(
+    const fileapi::FileSystemURL& url) {
+  if (!url.is_valid() || url.type() != fileapi::kFileSystemTypeDrive)
+    return base::FilePath();
+  return ExtractDrivePath(url.path());
+}
+
 std::string EscapeCacheFileName(const std::string& filename) {
   // This is based on net/base/escape.cc: net::(anonymous namespace)::Escape
   std::string escaped;
   for (size_t i = 0; i < filename.size(); ++i) {
     char c = filename[i];
     if (c == '%' || c == '.' || c == '/') {
       base::StringAppendF(&escaped, "%%%02X", c);
     } else {
       escaped.push_back(c);
     }
@@ skipping 145 matching lines @@
   proto->set_last_modified(file_info.last_modified.ToInternalValue());
   proto->set_last_accessed(file_info.last_accessed.ToInternalValue());
   proto->set_creation_time(file_info.creation_time.ToInternalValue());
 }
 
 void EmptyFileOperationCallback(DriveFileError error) {
 }
 
 }  // namespace util
 }  // namespace drive