Fix Mandoline apptests on Windows.

sql/mojo/mojo_vfs.cc

 // Copyright 2015 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 "sql/mojo/mojo_vfs.h"
 
 #include "base/logging.h"
 #include "base/rand_util.h"
 #include "base/strings/stringprintf.h"
 #include "components/filesystem/public/interfaces/file.mojom.h"
@@ skipping 43 matching lines @@
   filesystem::FilePtr file_ptr;
 };
 
 filesystem::FilePtr& GetFSFile(sqlite3_file* vfs_file) {
   return reinterpret_cast<MojoVFSFile*>(vfs_file)->file_ptr;
 }
 
 int MojoVFSClose(sqlite3_file* file) {
   DVLOG(1) << "MojoVFSClose(*)";
   using filesystem::FilePtr;
+  filesystem::FileError error = filesystem::FILE_ERROR_FAILED;
+  // Must call File::Close explicitly instead of just deleting the file, since
+  // otherwise we wouldn't have an object to wait on.
+  GetFSFile(file)->Close(mojo::Capture(&error));
+  GetFSFile(file).WaitForIncomingResponse();
   GetFSFile(file).~FilePtr();
   return SQLITE_OK;
 }
 
 int MojoVFSRead(sqlite3_file* sql_file,
                 void* buffer,
                 int size,
                 sqlite3_int64 offset) {
   DVLOG(1) << "MojoVFSRead (" << size << " @ " << offset << ")";
   filesystem::FileError error = filesystem::FILE_ERROR_FAILED;
@@ skipping 347 matching lines @@
 
   CHECK(sqlite3_vfs_register(parent_, 1) == SQLITE_OK);
   CHECK(sqlite3_vfs_unregister(&mojo_vfs) == SQLITE_OK);
 }
 
 filesystem::DirectoryPtr& ScopedMojoFilesystemVFS::GetDirectory() {
   return root_directory_;
 }
 
 }  // namespace sql