Cleanup: Remove using statements from webkit/fileapi header files.

webkit/fileapi/isolated_file_util.h

 // 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.
 
 #ifndef WEBKIT_FILEAPI_ISOLATED_FILE_UTIL_H_
 #define WEBKIT_FILEAPI_ISOLATED_FILE_UTIL_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "webkit/fileapi/local_file_util.h"
 #include "webkit/storage/webkit_storage_export.h"
 
 namespace fileapi {
 
 class FileSystemOperationContext;
 
 class WEBKIT_STORAGE_EXPORT_PRIVATE IsolatedFileUtil : public LocalFileUtil {
  public:
   IsolatedFileUtil();
   virtual ~IsolatedFileUtil() {}
 
   // LocalFileUtil overrides.
-  virtual PlatformFileError GetLocalFilePath(
+  virtual base::PlatformFileError GetLocalFilePath(
       FileSystemOperationContext* context,
       const FileSystemURL& file_system_url,
       FilePath* local_file_path) OVERRIDE;
 };
 
 // Dragged file system is a specialized IsolatedFileUtil where read access to
 // the virtual root directory (i.e. empty cracked path case) is allowed
 // and single isolated context may be associated with multiple file paths.
 class WEBKIT_STORAGE_EXPORT_PRIVATE DraggedFileUtil : public IsolatedFileUtil {
  public:
@@ skipping 14 matching lines @@
       FileSystemOperationContext* context,
       const FileSystemURL& url) OVERRIDE;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(DraggedFileUtil);
 };
 
 }  // namespace fileapi
 
 #endif  // WEBKIT_FILEAPI_ISOLATED_FILE_UTIL_H_