[downloads] Move platform specific code out of DownloadTargetDeterminer.

chrome/browser/download/download_confirmation_reason.h

+// Copyright 2016 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 CHROME_BROWSER_DOWNLOAD_DOWNLOAD_CONFIRMATION_REASON_H_
+#define CHROME_BROWSER_DOWNLOAD_DOWNLOAD_CONFIRMATION_REASON_H_
+
+// Reason why DownloadTargetDeterminer requested additional confirmation for the
+// target path via RequestConfirmation delegate method.
+enum class DownloadConfirmationReason {
+  NONE,
+
+  // Unexpected error.
+  UNEXPECTED,
+
+  // "Save as" or "Save link as".
+  SAVE_AS,
+
+  // The user has set a preference requiring prompts for all downloads.
+  PREFERENCE,
+
+  // The target name was too long and couldn't be truncated.
+  NAME_TOO_LONG,
+
+  // There were unresolved conflicts with the target path.
+  TARGET_CONFLICT,
+
+  // The target path isn't writeable. Also may indicate that a previous attempt
+  // to write to the path failed.
+  TARGET_PATH_NOT_WRITEABLE,
+
+  // The target path cannot accommodate a file of this size.
+  TARGET_NO_SPACE,
+};
+
+#endif  // CHROME_BROWSER_DOWNLOAD_DOWNLOAD_CONFIRMATION_REASON_H_