Remove defaultDetailsSummaryText().

Use Locale::queryString() instead.

BUG=298020
TEST=none; no behavior changes.

Review URL: https://codereview.chromium.org/25045008

git-svn-id: svn://svn.chromium.org/blink/trunk@158554 bbb929c8-8fbe-4397-9dbb-9b2b20218538