Use std::swap() in HashTable::swap()

From WebKit r164378 by Zan Dobersek <zdobersek@igalia.com>

Use std::swap() to swap the member variable values of two HashTable objects in HashTable::swap().

Review URL: https://codereview.chromium.org/197213016

git-svn-id: svn://svn.chromium.org/blink/trunk@169362 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Removed Blink Gamepad transition cruft

BUG=344556
TBR=eseidel@chromium.org

Review URL: https://codereview.chromium.org/196833003

git-svn-id: svn://svn.chromium.org/blink/trunk@169363 bbb929c8-8fbe-4397-9dbb-9b2b20218538