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

webkit/fileapi/media/native_media_file_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 "webkit/fileapi/media/native_media_file_util.h"
 
-#include "net/base/mime_util.h"
 #include "webkit/fileapi/file_system_operation_context.h"
 #include "webkit/fileapi/media/media_path_filter.h"
 #include "webkit/fileapi/media/filtering_file_enumerator.h"
 
+using base::PlatformFile;
 using base::PlatformFileError;
 using base::PlatformFileInfo;
 
 namespace fileapi {
 
-class MediaPathFilter;
-
 NativeMediaFileUtil::NativeMediaFileUtil() {
 }
 
 PlatformFileError NativeMediaFileUtil::CreateOrOpen(
     FileSystemOperationContext* context,
     const FileSystemURL& url,
     int file_flags,
     PlatformFile* file_handle,
     bool* created) {
   // TODO(tzik): Apply context()->media_path_filter() here when we support write
@@ skipping 97 matching lines @@
   if (error != base::PLATFORM_FILE_OK)
     return error;
 
   if (file_info->is_directory ||
       context->media_path_filter()->Match(*platform_path))
     return base::PLATFORM_FILE_OK;
   return base::PLATFORM_FILE_ERROR_NOT_FOUND;
 }
 
 }  // namespace fileapi