Support <input webkitdirectory> in KDE file chooser

Currently NOTREACHED() is reached when the KDE file chooser is active.

TEST=Manually:
1. Start Chrome in a KDE environment
2. Visit data:text/html,<input type=file webkitdirectory>
3. Click on the file chooser and select any directory.
4. In KDE environments, NOTREACHED() is reached.

5. Repeat the same steps with the env var NO_CHROME_KDE_FILE_DIALOG=1,
   and observe that NOTREACHED() is not reached any more, because the
   gtk fallback is used (which works correctly since r240564).

Review URL: https://codereview.chromium.org/445883002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@287863 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/ui/libgtk2ui/select_file_dialog_impl_kde.cc

@@ -354,7 +354,7 @@ void SelectFileDialogImplKDE::FileSelected(const base::FilePath& path,
     *last_saved_path_ = path.DirName();
   else if (type_ == SELECT_OPEN_FILE)
     *last_opened_path_ = path.DirName();
-  else if (type_ == SELECT_FOLDER)
+  else if (type_ == SELECT_FOLDER || type_ == SELECT_UPLOAD_FOLDER)
     *last_opened_path_ = path;
   else
     NOTREACHED();