Fix IWYU violators that don't include scoped_ptr.h in Windows build.

content/browser/fileapi/dragged_file_util_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 <stddef.h>
 
 #include <map>
 #include <queue>
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/files/file_enumerator.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/logging.h"
 #include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "base/time/time.h"
 #include "build/build_config.h"
 #include "content/public/test/async_file_test_helper.h"
 #include "content/public/test/test_file_system_context.h"
 #include "content/test/fileapi_test_file_set.h"
 #include "storage/browser/fileapi/dragged_file_util.h"
 #include "storage/browser/fileapi/file_system_context.h"
 #include "storage/browser/fileapi/file_system_operation_context.h"
 #include "storage/browser/fileapi/isolated_context.h"
@@ skipping 518 matching lines @@
     EXPECT_EQ(base::File::FILE_OK,
               file_util()->Truncate(GetOperationContext().get(), url, 999));
     ASSERT_EQ(base::File::FILE_OK,
               file_util()->GetFileInfo(GetOperationContext().get(), url,
                                        &info, &platform_path));
     EXPECT_EQ(999, info.size);
   }
 }
 
 }  // namespace content