Use std::swap() in HashTable::swap()
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: bf5cd6ccde378db821296732a091cfbcf5285fbd@169362 bbb929c8-8fbe-4397-9dbb-9b2b20218538

primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs