Remove gulp task

gulpfile.js

@@ -1,4 +1,3 @@
-const { execFile } = require('child_process');
 const gulp = require('gulp');
 const merge2 = require('merge2');
 const path = require('path');
@@ -35,24 +34,6 @@ function makeCompileFn(dev) {
   };
 }
 
-/**
- * If process.env.NODE_H2 is defined and nvm is installed, uses nvm to set
- * $NODE_H2 as the default node binary (with --expose-http2 included).
- */
-gulp.task('h2-setup', () => {
-  return new Promise((resolve, reject) => {
-    execFile('./setup.sh', (err, stdout, stderr) => {
-      (stdout = stdout.trim()) && console.log(stdout);
-      (stderr = stderr.trim()) && console.error(stderr);
-      if (err) {
-        reject(err);
-      } else {
-        resolve();
-      }
-    });
-  });
-})
-
 /**
  * Runs tslint on files in src/, with linting rules defined in tslint.json.
  */