Simplify babel-generator/node/index.js

[forivall]

The Node class was unused as a class, and the class was just being used as a bundle of static functions.

I noticed this while working on #3315.

Mostly indentation changes, see diff with whitespace changes ignored

[codecov-io]

Current coverage is 85.18%

Merging #3316 into master will decrease coverage by -0.11% as of 970dae4

@@            master   #3316   diff @@
======================================
  Files          215     215       
  Stmts        15773   15759    -14
  Branches      3382    3382       
  Methods          0       0       
======================================
- Hit          13454   13424    -30
- Partial        688     712    +24
+ Missed        1631    1623     -8

Review entire Coverage Diff as of 970dae4

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[hzoo]

Do we want to rename the filename from node? I guess it's still good

[amasad]

Can we run a quick benchmark to make sure there is no perf regression? Just parse and generate something like jQuery before and after. Thank you

[hzoo]

Like the one mentioned in https://phabricator.babeljs.io/T6884

[forivall]

benchmark code: https://gist.github.com/forivall/d303673559be900526ce

before

babylon 125
babel generator (cold) 400
babel generator (warm 1) 224
babel generator (warm avg) 225.46

after

babylon 122
babel generator (cold) 404
babel generator (warm 1) 229
babel generator (warm avg) 225.51

[hzoo]

Ok great, negligible

[amasad]

cool, thanks!