Remove stray platform_file.h from content

content/browser/fileapi/file_system_dir_url_request_job_unittest.cc

 // Copyright 2013 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/browser/fileapi/file_system_dir_url_request_job.h"
 
 #include <string>
 
 #include "base/file_util.h"
 #include "base/files/file_path.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/format_macros.h"
 #include "base/memory/scoped_vector.h"
 #include "base/memory/weak_ptr.h"
 #include "base/message_loop/message_loop.h"
-#include "base/platform_file.h"
 #include "base/run_loop.h"
 #include "base/strings/string_piece.h"
 #include "base/strings/utf_string_conversions.h"
 #include "content/public/test/mock_special_storage_policy.h"
 #include "content/public/test/test_file_system_backend.h"
 #include "content/public/test/test_file_system_context.h"
 #include "net/base/net_errors.h"
 #include "net/base/net_util.h"
 #include "net/base/request_priority.h"
 #include "net/http/http_request_headers.h"
@@ skipping 400 matching lines @@
   ASSERT_FALSE(request_->status().is_success());
   EXPECT_EQ(net::ERR_FILE_NOT_FOUND, request_->status().error());
 
   ASSERT_FALSE(
       fileapi::ExternalMountPoints::GetSystemInstance()->RevokeFileSystem(
           kValidExternalMountPoint));
 }
 
 }  // namespace (anonymous)
 }  // namespace content