Remove unused GraphicsContext::drawEllipse()

Also update the GC unit test with explicit {fill|stroke}Ellipse calls to
preserve current test semantics.

R=senorblanco@chromium.org,schenney@chromium.org

Review URL: https://codereview.chromium.org/258293002

git-svn-id: svn://svn.chromium.org/blink/trunk@172978 bbb929c8-8fbe-4397-9dbb-9b2b20218538
[DevTools] Clean up text autosizing.

BUG=none

Review URL: https://codereview.chromium.org/253843007

git-svn-id: svn://svn.chromium.org/blink/trunk@172979 bbb929c8-8fbe-4397-9dbb-9b2b20218538