Fix the case of function field via this initialization.

Fix the case of function field via this initialization.

The problematic code is like:

class C {
  Function f;
  C(int this.f());
}

In this case Send's selector is actually a FunctionExpression.

Currently it gets unparsed weirdly: C(this.int f()), but DartVM accepts that so let
leave it in this state for now.

R=smok@google.com

Committed: https://code.google.com/p/dart/source/detail?r=10631

[Anton Muhin, 2012-08-14 11:11:55]

friendly ping

[Roman, 2012-08-14 11:21:01]

lgtm