Make some Selection function arguments non-optional

http://w3c.github.io/selection-api/#idl-def-Selection

Firefox Nightly and IE11 both throw for the three tested cases, making
this change very likely Web compatible.

Some were left alone, pending a spec bug:
https://github.com/w3c/selection-api/issues/30

Review URL: https://codereview.chromium.org/792013002

git-svn-id: svn://svn.chromium.org/blink/trunk@186929 bbb929c8-8fbe-4397-9dbb-9b2b20218538
6 files changed
tree: a51af83eca084d6e046703db77e66f1b2e14819a
  1. third_party/