JSHydra: return {foo:bar} produces broken code

[trev]

How to reproduce

1. Add return {foo: 1}; to one of our core modules imported into Adblock Plus for Chrome.
2. Build Adblock Plus for Chrome.

Observed behaviour

The code is converted to:

return
{
  foo: bar
};

Note the newline after return, the browser will imply a semicolon there - this will be interpreted as a return statement followed by a block. Consequently, the browser will complain about a syntax error (unexpected colon).

Expected behaviour

The opening bracket of the object should be on the same line:

return {
  foo: bar
};

[trev]

Fixed: ​https://hg.adblockplus.org/jshydra/rev/5620200c91ff