Rename focusedNode to focusedElement in UserTypingGestureIndicator.

Also, remove unused StdLibExtras.h inclusion.

BUG=258763

Review URL: https://chromiumcodereview.appspot.com/19567005

git-svn-id: svn://svn.chromium.org/blink/trunk@154635 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Rename PopupListBox::m_focusedNode to m_focusedElement.

BUG=258763

Review URL: https://chromiumcodereview.appspot.com/19683008

git-svn-id: svn://svn.chromium.org/blink/trunk@154636 bbb929c8-8fbe-4397-9dbb-9b2b20218538