Enable canvas.drawFocusIfNeeded() by default.

Enable following methods:
  - drawFocusIfNeeded(Element);
  - drawFocusIfNeeded(Path2D, Element);

Intent to ship:
  https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/KE_X_C6vOQQ

Additionally, we should remove the behavior that updates accessibility.
It has been transferred to 'Hit Regions' feature.

BUG=331923

Review URL: https://codereview.chromium.org/299823003

git-svn-id: svn://svn.chromium.org/blink/trunk@174904 bbb929c8-8fbe-4397-9dbb-9b2b20218538