We currently don't generate a ::ToJSON() method for WebIDL types with record<K,V>
members. These types should be safe to convert to JSON, as long as type V itself
is. Per spec, type K is always a DOMString, USVString, or ByteString.
This patch was autogenerated by my decomponents.py
It covers almost every file with the extension js, jsm, html, py,
xhtml, or xul.
It removes blank lines after removed lines, when the removed lines are
preceded by either blank lines or the start of a new block. The "start
of a new block" is defined fairly hackily: either the line starts with
//, ends with */, ends with {, <