Decrease call sites of ScriptState::current()

Basically ScriptState::current() should be called only in the binding layer where the current ScriptState is guaranteed to be correct. This CL removes call sites of ScriptState::current() in non-binding layer.

BUG=357144

Review URL: https://codereview.chromium.org/297513008

git-svn-id: svn://svn.chromium.org/blink/trunk@174599 bbb929c8-8fbe-4397-9dbb-9b2b20218538