Rename TouchList::create() to TouchList::adopt() for clarity

Rename TouchList::create() to TouchList::adopt() for clarity as it adopts the
Vector argument. This is consistent with similar factory functions such as
StaticNodeList::adopt(), CSSSelectorList::adopt(), SelectorQuery::adopt(), ...

R=adamk@chromium.org, esprehn@chromium.org

Review URL: https://codereview.chromium.org/483343002

git-svn-id: svn://svn.chromium.org/blink/trunk@180583 bbb929c8-8fbe-4397-9dbb-9b2b20218538