Remove weird, confusing, unreachable code

Remove weird, confusing, unreachable code

The removed code was doing first-order dependency resolution if a single
module was passed in as a string.

This is crazy because:
* passing in 'foo' triggered it but passing in ['foo'] didn't
* dependency resolution is resolve()'s responsibility
* all callers were passing in arrays produced by resolve(), so this code
  was never reached

Change-Id: I081e2bf90cead63437e495006c78254cf65e3847