[downloads] Move platform specific code out of DownloadTargetDeterminer.

chrome/browser/download/download_file_picker.h

Index: chrome/browser/download/download_file_picker.h
diff --git a/chrome/browser/download/download_file_picker.h b/chrome/browser/download/download_file_picker.h
index 0763cf09fcd52deb95bbc7f8b852d9513dcad7a9..80fc2c44ffefa2039fae79d05539a641328873c0 100644
--- a/chrome/browser/download/download_file_picker.h
+++ b/chrome/browser/download/download_file_picker.h
@@ -7,6 +7,7 @@
 
 #include "base/callback.h"
 #include "base/macros.h"
+#include "chrome/browser/download/download_confirmation_result.h"
 #include "ui/shell_dialogs/select_file_dialog.h"
 
 namespace base {
@@ -26,20 +27,21 @@ class DownloadFilePicker : public ui::SelectFileDialog::Listener {
   //    selection, then this parameter will be the empty path. On Chrome OS,
   //    this path may contain virtual mount points if the user chose a virtual
   //    path (e.g. Google Drive).
-  typedef base::Callback<void(const base::FilePath& virtual_path)>
-      FileSelectedCallback;
+  typedef base::Callback<void(DownloadConfirmationResult,
+                              const base::FilePath& virtual_path)>
+      ConfirmationCallback;
 
   // Display a file picker dialog for |item|. The |suggested_path| will be used
   // as the initial path displayed to the user. |callback| will always be
   // invoked even if |item| is destroyed prior to the file picker completing.
   static void ShowFilePicker(content::DownloadItem* item,
                              const base::FilePath& suggested_path,
-                             const FileSelectedCallback& callback);
+                             const ConfirmationCallback& callback);
 
  private:
   DownloadFilePicker(content::DownloadItem* item,
                      const base::FilePath& suggested_path,
-                     const FileSelectedCallback& callback);
+                     const ConfirmationCallback& callback);
   ~DownloadFilePicker() override;
 
   // Runs |file_selected_callback_| with |virtual_path| and then deletes this
@@ -56,7 +58,7 @@ class DownloadFilePicker : public ui::SelectFileDialog::Listener {
   base::FilePath suggested_path_;
 
   // Callback invoked when a file selection is complete.
-  FileSelectedCallback file_selected_callback_;
+  ConfirmationCallback file_selected_callback_;
 
   // For managing select file dialogs.
   scoped_refptr<ui::SelectFileDialog> select_file_dialog_;