Remove HTMLMediaElement::hasMediaControls()

It is consistently used as a null check for mediaControls() and is no
more efficient, so keep only mediaControls().

toMediaControls() includes an equivalent null check and
ASSERT_WITH_SECURITY_IMPLICATION.

BUG=448795

Review URL: https://codereview.chromium.org/943333003

git-svn-id: svn://svn.chromium.org/blink/trunk@190711 bbb929c8-8fbe-4397-9dbb-9b2b20218538
2 files changed